Questions tagged [function]
Questions on function usage in the context of Unix & Linux (mostly but not exclusively shell scripts). Questions on programming in Python, Perl, Ruby, etc. should be asked on Stack Overflow.
580 questions
4
votes
1
answer
162
views
Run in background avoiding any job control message from the shell [duplicate]
Lets define a shell function (here the shell is Bash) and test it
$ s () { xterm -e sleep 5 & }
$ s
[1] 307926
$
[1]+ Done xterm -e sleep 5
$
With my specific meaning of ...
- 1,336
7
votes
1
answer
559
views
bash - how to remove a local variable (inside a function)
I've read what's listed in Bibliography regarding unset, declare, local and "Shell Functions".
My version of Bash is
GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu)
var='outer'
...
- 185
2
votes
1
answer
186
views
Why does a 'pipe-to-awk' behave differently inside a function?
I'm using alsa to fiddle around with the volume on a Bluetooth speaker I have connected. It's a 1-speaker setup; just something to provide some background.
I can 'get' the volume setting fm the CLI as ...
- 3,727
3
votes
1
answer
525
views
Strange variable scope behavior when calling function recursivly
EDIT: sorry. this is my first question here.
Here is a minimal working example
#!/bin/bash
#
count=0
function something() {
if test -f "$1"; then
# is a file
((count++))
...
- 43
-1
votes
1
answer
156
views
Override tr in ~/.bashrc
I'm trying to create a function to translate words via a custom script:
function mean() {
~/scripts/translate.sh $1
}
I would prefer the function to be named tr, as it is much shorter and faster ...
- 23
3
votes
1
answer
248
views
How to overload / customize bash (or any other shell) commands handler?
When in bash some non existing command is run, corresponding error message appears:
$ non-existent-command
non-existent-command: command not found
Is it possible to customize this behavior?
I would ...
- 279
3
votes
2
answers
358
views
how to alias the `history` function in fish shell
I'm trying to set the fish history pager to be bat -l fish for syntax highlighting.
(i.e. set the PAGER environment variable bat -l fish just for the history command).
I tried:
# 1:
alias history &...
- 149
0
votes
0
answers
34
views
eLisp: how to write a correct remove-number-grouping function?
In EmacsWiki, sub page "Add Commas To Numbers", it says:
Here is how to transform a number such as 12345 into the string “12,345”.
(defun add-number-grouping (number &optional separator)...
- 193
0
votes
2
answers
76
views
Bash scripting: When to use variable, when function?
basic, innocent question:
In bash scripting, why ever using a function, if one can set a variable containing command substitution with the essence of the function - a certain command or set of ...
- 193
2
votes
0
answers
47
views
Can't unalias then redefine as a function in the same conditional [duplicate]
Here is a simplified implementation of an issue in my bash/zsh aliases file:
alias foobar='echo bar' # this is out of my control
if true; then
unalias foobar
echo we got inside the conditional
...
- 4,132
1
vote
1
answer
2k
views
How to get function keys working on a Yunzii keyboard?
I have a Yunzii B705 keyboard. It has a row of multimedia keys that double as the function keys. Neither the multimedia nor function keys can work. I don't care about using the multimedia functions, ...
- 4,067
0
votes
4
answers
291
views
return value of a function
Can somebody explain me, why the return value of a bash function is always echoed in the function and then consumed by my_var=$(my_func arg1 arg2 ..), when i look through code examples.
my_func ()
{...
- 370
3
votes
1
answer
93
views
How does my function break `functions`?
I wrote a ksh function for git checkout (I've removed some irrelevant proprietary components for the sake of the public question, if you're wondering why it's useful to me):
# Checkout quicker
...
- 331
1
vote
2
answers
119
views
Start interactive function definition from shell-script
Using zsh or bash, I want to run a script that may prompt the user for multiple commands and store them as a function, however I'm finding that eval "function $FNCNAME() {" or echo "...
- 31
1
vote
3
answers
356
views
Run nested local bash functions via ssh
I have a script like this that declares many functions which use another functions, etc.:
#!/bin/bash
function a {
...
}
function b {
...
a
...
}
...
And another script that uses ...
- 133