All Questions
10
questions
1
vote
2
answers
342
views
Please explain the behavior of these parameter expansions using IFS?
I'm trying to figure out how to use the ${parameter%word} expansion with $@ and $*. It started by trying to make a script to combine pdfs using ghostscript, but I ran into some weird behavior with ...
- 53
0
votes
1
answer
183
views
How to set sed command correctly
When I try following commands, (I'd like to rewrite sql).
Day='2020/12/1'
Dir=/home/test/data
sql=`cat $Dir"/"$test".sql" | sed -e "s/Day/$Day/g"`
I suffered following ...
- 197
73
votes
1
answer
13k
views
What is the difference between the "...", '...', $'...', and $"..." quotes in the shell?
Sometimes I see shell scripts use all of these different ways of quoting some text: "...", '...', $'...', and $"...". Why are there so many different kinds of quote being used?
Do ...
- 77.2k
2
votes
1
answer
81
views
Generating quoted command arguments
I'm working with a HTTP API that demands a very particular set of signed headers + JSON body. And I really want to cURL it for debugging and sanity in general.
So, I've written a small script that, ...
- 123
10
votes
1
answer
17k
views
Using a variable as a case condition in zsh
My question is the zsh equivalent of the question asked here: How can I use a variable as a case condition? I would like to use a variable for the condition of a case statement in zsh. For example:
...
- 393
7
votes
1
answer
3k
views
Why does `zip` in a for loop work when the file exists, but not when it doesn't?
I have a directory that contains several sub-directories. There is a question about zipping the files that contains an answer that I ever-so-slightly modified for my needs.
for i in */; do zip "zips/...
- 11.9k
0
votes
2
answers
3k
views
Wildcard not working in quotes
The script is supposed to loop over subdirectories and match all the filenames (FLA.*Image.*file.jpg and FLA.*Image.jpg) in subdirectories and process it. It also create output folder inside the ...
- 1
4
votes
1
answer
1k
views
Problem with passing parameters containing spaces and wild card characters
I have a problem passing parameters if the parameters may contain wildcards and/or spaces, if those parameters are optional. Since this sounds pretty abstract, let's have a small example: The ...
- 697
181
votes
1
answer
78k
views
When is double-quoting necessary?
The old advice used to be to double-quote any expression involving a $VARIABLE, at least if one wanted it to be interpreted by the shell as one single item, otherwise, any spaces in the content of $...
- 15.7k
3
votes
3
answers
968
views
Zsh function with su and echo
I'm trying to add a function to my .zshrc that makes adding new USE flags to my /etc/portage/package.use file easier. Normally, I'd have to do
su -c 'echo "net-misc/aria2 bash-completion bittorrent" &...
- 133