All Questions
96 questions
1
vote
3
answers
84
views
Bash/macOS: Getting a variable by its name, inside of a function [duplicate]
In Bash for macOS, I need to be able to pass a string to a function and return the value of a variable named after that string, as well as the string itself.
Here's what I have so far, which doesn't ...
- 111
-4
votes
1
answer
98
views
How to protect variable name inside shell arithmetic?
Variables can be protected with curly braces.
Mynewvar=1
echo $Mynewvar
1
echo ${Mynewvar}
1
However I can no longer protect them when inside shell arithmetic.
Mynewvar=1
echo $((Mynewvar+9))
10
echo ...
- 1
1
vote
1
answer
75
views
Separate variable scope spawning commands under job control
Is is possible in bash - or other sh-derivative shell - to run in the foreground from command-line a list of commands that have their own variable scope (so any values assigned to variables in that ...
-1
votes
1
answer
177
views
shell endless loop for find command
I was working on a shell script where I came across this problem that I couldn't solve
The following command is supposed to find all shell files in /.
PATHS_SHELL=$(sudo find / -name '*.sh') ...
- 21
0
votes
1
answer
1k
views
Variable expansion with sh -c executed over ssh
I'm trying to execute an command via sh -c over SSH in an LXC container. Since lxc-attach is involved I have to use sh -c like this: ssh <host> "lxc-attach -- sh -c \"<command>;&...
- 1
2
votes
1
answer
133
views
count variable not getting incremented
I have a scenario where I am running the following code:
error_count=0
(cd tmp1 && terraform init -backend=false > /dev/null && terraform validate && echo "Terraform ...
- 85
0
votes
0
answers
155
views
Disable Bash completion for a single environmental variable
Suppose I have an environmental variable $SAVE_DIR=/etc/ used to return to a saved directory (here /etc/) from any Bash shell. Typing cd $SAV[Tab] expands to cd $SAVE_DIR which is quite convenient. ...
- 121
-1
votes
1
answer
548
views
Define multiple variables inside while loop
I'm currently reading from a csv file and iterating through each line to define variables in some columns that I will use later.
Say my csv file looks as follows:
Column1,Column2,Column3,Column4,...
- 71
2
votes
0
answers
125
views
Why `declare -p VAR` returns "declare -- VAR" on an unset local variable but gives an error "bash: declare: A: not found" on an unset global variable?
I don't understand:
$ declare -i VAR=0; \
> echo "$A"; \
> fun() { local -i VAR=1; echo {; echo "$VAR"; declare -p VAR; unset VAR; echo "$VAR"; declare -p VAR; echo ...
- 270
1
vote
2
answers
222
views
Linux: parser variable from set command to bash file
I am trying pass a variable from the set command to a bash script.
$ set BeginTime=2021-10-11 2:23:00 & ./getBeginTime.sh
File getBeginTime.sh:
local getBeginTime=$(set | grep BeginTime)
echo &...
- 11
4
votes
1
answer
1k
views
What exactly happens when I type " unset * " in prompt?
Say I connected to a Linux system as root.
What exactly happens when I type unset *?
- 405
1
vote
1
answer
753
views
How to do output of both variable and it's value to a file
I'm struggling a bit with this task, for example I can do a simple loop to send variables values into a file with for loop. But how to get something before output of the variable value? I did ...
- 13
1
vote
1
answer
104
views
My multiple variables in a function do not get expressed as aliases. I think my syntax is faulty
In bashrc, I have this alarm function which can take 3 variables:
a () {
local $1="${1:-3600}"
local $2="${2:-paa}"
local $3="${3:-alarm}"
sleep "$1" && $2 && $3
}
alias ...
- 35
5
votes
1
answer
22k
views
conditional binary operator expected
var="$(command1 -l '$var2' -c 'command2|grep -c "search"')"
if [[ var !=0 ]]; then
fi
Why am I getting "conditional binary operator expected". I searched already and. I. see that [[]] is a test ...
- 113
3
votes
3
answers
4k
views
Multiple commands and subshell execution after pipeline
Ok, I know that in Bash (by default, without 'lastpipe' bash option enabled) every variable assigned after a pipeline is, indeed, executed in a subshell and the variable itself dies after subshell ...
- 41