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What is the logic behind how bash tests for true/false?
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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
This:
echo $VAR
yields: something
And this:
[[ -z "$VAR" ]]
echo $?
yields: 1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head and I need some kind logical way to think about this before I go insane.
UPDATE
Here's some real code. I can't get this to fucking work for the life of me. Fuck bash. :)
tmux_man_page() {
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#{pane_id}")
export TMUX_MAN_PANE
tmux select-pane -t {last}
fi
fi
}
UPDATE 2: Success
Finally figured it out. Was hvaing a hell of a time getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Holy shit, I don't know how people program in Bash. Drives me nuts. Sorry for the foul language. I was apeshit. :) Here's the working code:
tmux_man_page() {
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#{pane_id}")
export TMUX_MAN_PANE
tmux select-pane -t {last}
fi
fi
}
tmux_man_page_close() {
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
}
bash
asked 1 hour ago
StevieDStevieD
1679
add a comment |
This:
echo $VAR
yields: something
And this:
[[ -z "$VAR" ]]
echo $?
yields: 1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head and I need some kind logical way to think about this before I go insane.
UPDATE
Here's some real code. I can't get this to fucking work for the life of me. Fuck bash. :)
tmux_man_page() {
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#{pane_id}")
export TMUX_MAN_PANE
tmux select-pane -t {last}
fi
fi
}
UPDATE 2: Success
Finally figured it out. Was hvaing a hell of a time getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Holy shit, I don't know how people program in Bash. Drives me nuts. Sorry for the foul language. I was apeshit. :) Here's the working code:
tmux_man_page() {
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#{pane_id}")
export TMUX_MAN_PANE
tmux select-pane -t {last}
fi
fi
}
tmux_man_page_close() {
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
}
bash
asked 1 hour ago
StevieDStevieD
1679
1
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
1 hour ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
1 hour ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
1 hour ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
1 hour ago
Jesus, finally figured it out. Posting solution.
– StevieD
1 hour ago
add a comment |
This:
echo $VAR
yields: something
And this:
[[ -z "$VAR" ]]
echo $?
yields: 1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head and I need some kind logical way to think about this before I go insane.
UPDATE
Here's some real code. I can't get this to fucking work for the life of me. Fuck bash. :)
tmux_man_page() {
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#{pane_id}")
export TMUX_MAN_PANE
tmux select-pane -t {last}
fi
fi
}
UPDATE 2: Success
Finally figured it out. Was hvaing a hell of a time getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Holy shit, I don't know how people program in Bash. Drives me nuts. Sorry for the foul language. I was apeshit. :) Here's the working code:
tmux_man_page() {
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#{pane_id}")
export TMUX_MAN_PANE
tmux select-pane -t {last}
fi
fi
}
tmux_man_page_close() {
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
}
bash
asked 1 hour ago
StevieDStevieD
1679
This:
echo $VAR
yields: something
And this:
[[ -z "$VAR" ]]
echo $?
yields: 1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head and I need some kind logical way to think about this before I go insane.
UPDATE
Here's some real code. I can't get this to fucking work for the life of me. Fuck bash. :)
tmux_man_page() {
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#{pane_id}")
export TMUX_MAN_PANE
tmux select-pane -t {last}
fi
fi
}
UPDATE 2: Success
Finally figured it out. Was hvaing a hell of a time getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Holy shit, I don't know how people program in Bash. Drives me nuts. Sorry for the foul language. I was apeshit. :) Here's the working code:
tmux_man_page() {
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#{pane_id}")
export TMUX_MAN_PANE
tmux select-pane -t {last}
fi
fi
}
tmux_man_page_close() {
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
}
bash
bash
asked 1 hour ago
StevieDStevieD
1679
asked 1 hour ago
StevieDStevieD
1679
edited 57 mins ago
StevieD
asked 1 hour ago
StevieDStevieD
1679
asked 1 hour ago
StevieDStevieD
1679
asked 1 hour ago
StevieDStevieD
1679
1679
1
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
1 hour ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
1 hour ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
1 hour ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
1 hour ago
Jesus, finally figured it out. Posting solution.
– StevieD
1 hour ago
add a comment |
1
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
1 hour ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
1 hour ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
1 hour ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
1 hour ago
Jesus, finally figured it out. Posting solution.
– StevieD
1 hour ago
1
1
Your update does not include enough information. Please (a) include the values of
TERM, TMUX, and TMUX_MAN_PANE from before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
1 hour ago
Your update does not include enough information. Please (a) include the values of
TERM, TMUX, and TMUX_MAN_PANE from before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
1 hour ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
1 hour ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
1 hour ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
1 hour ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
1 hour ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
1 hour ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
1 hour ago
Jesus, finally figured it out. Posting solution.
– StevieD
1 hour ago
Jesus, finally figured it out. Posting solution.
– StevieD
1 hour ago
add a comment |
1 Answer
1
active
oldest
votes
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 1 hour ago
John1024John1024
48.4k5113128
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
1 hour ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
1 hour ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
1 hour ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 1 hour ago
John1024John1024
48.4k5113128
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
1 hour ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
1 hour ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
1 hour ago
add a comment |
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 1 hour ago
John1024John1024
48.4k5113128
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
1 hour ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
1 hour ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
1 hour ago
add a comment |
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 1 hour ago
John1024John1024
48.4k5113128
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered 1 hour ago
John1024John1024
48.4k5113128
edited 1 hour ago
answered 1 hour ago
John1024John1024
48.4k5113128
answered 1 hour ago
John1024John1024
48.4k5113128
answered 1 hour ago
John1024John1024
48.4k5113128
48.4k5113128
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
1 hour ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
1 hour ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
1 hour ago
add a comment |
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
1 hour ago
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
1 hour ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
1 hour ago
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
1 hour ago
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
1 hour ago
1
1
@StevieD Run
set -x and then run your code. This will show you how every step is evaluated.– John1024
1 hour ago
@StevieD Run
set -x and then run your code. This will show you how every step is evaluated.– John1024
1 hour ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
1 hour ago
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
1 hour ago
add a comment |
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1
Your update does not include enough information. Please (a) include the values of
TERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
1 hour ago
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
1 hour ago
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
1 hour ago
I should just be going this in perl. Fuck this crazy shit.
– StevieD
1 hour ago
Jesus, finally figured it out. Posting solution.
– StevieD
1 hour ago