Questions tagged [declare]
The declare tag has no usage guidance.
11
questions
3
votes
1
answer
78
views
Why does substituting eval with declare (for creating dynamic variables) result in an empty variable?
With bash >5, I'm trying to assign a different value to variables depending on the architecture specified in a variable. I use a function to do so. This works perfectly:
# arguments:
variable ...
- 33
1
vote
1
answer
35
views
correct way of storing external programm and making it executable?
I downloaded the CLI Client habash for the habit/routine gameification project habatica.com.
In the fandom wiki for habash it is written that, I need to set environment variables. Additonally I want ...
- 31
1
vote
1
answer
840
views
Using cURL, jq, and declaration and for loop condition, I tried to download multiple files from a GitLab private repo, but it downloaded only one
I learned from the following sources:
curl -O: Download a file with curl on Linux / Unix command line
jq: How to urlencode data for curl command?
Multiple files and curl -J: download pdf files from ...
- 233
5
votes
1
answer
394
views
Declare command and shell expansion
I stumbled by accident on the following bash behaviour, which is for me kind of unexpected.
# The following works
$ declare bar=Hello # Line 1
$ declare -p bar ...
- 292
0
votes
1
answer
794
views
Reading variable from a txt file using bash
I'm new to bash.
I'm trying to write a script that will read data from a text find and declare some variables. In the example below we read from a tab delimited file "ab.txt" that looks like this:
...
- 101
2
votes
1
answer
383
views
How to read keyboard input and assign it to a local variable?
I have this very simple script:
#!/bin/bash
read local _test
echo "_test: $_test"
This is the output.
$ ./jltest.sh
sdfsdfs
_test:
I want the variable _test to be local only. Is this possible?
- 1,689
3
votes
2
answers
2k
views
What is a variable attribute?
I aim to understand the general concept of "variable attributes" hoping it will help me understand what is declare in Bash.
What is a variable attribute? Why would someone want to give an attribute ...
user149572
7
votes
1
answer
3k
views
Does `declare -a A` create an empty array `A` in Bash?
Does declare -a A create an empty array A in bash, or does it just set an attribute in case A is assigned to later?
Consider this code:
set -u
declare -a A
echo ${#A[*]}
echo ${A[*]}
A=()
echo ${#A[*...
- 797
28
votes
4
answers
20k
views
What is "declare" in Bash?
After reading ilkkachu's answer to this question I learned on the existence of the declare (with argument -n) shell built in.
help declare brings:
Set variable values and attributes.
Declare ...
user149572
3
votes
3
answers
3k
views
Function to conditionally set a variable read-only
If I had a script which sets variables read-only to some odd values, and sets errexit because of other unsafe operations:
#!/bin/bash
set -e
declare -r NOTIFY=$(case "$OS" in (macosx) echo ...
- 3,270
0
votes
2
answers
73
views
Parse 3rd entry in declare result
I have this:
cd 31
/Users/alexamil/WebstormProjects/oresoftware/botch/botch-shell-overrides.sh
the above style output, is given by this command:
declare -F my_bash_func
How can I grab just the ...
- 8,176