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458 questions linked to/from Why is using a shell loop to process text considered bad practice?
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2 answers
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The following link recommends against using loops in shells. bash variables in for loop range Why is this? Here is an example loop I just happened to be looking at when I came across that answer: ...
Zombo's user avatar
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0 votes
3 answers
2k views

Content of myfile: 123 **1 ** Script that attempts to display each word: for i in $(cat $myfile) do echo "$i" done the result is when echo *, it lists the files in my current ...
kelvin .C's user avatar
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422 votes
22 answers
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I would like to remove all leading and trailing spaces and tabs from each line in an output. Is there a simple tool like trim I could pipe my output into? Example file: test space at back test ...
rubo77's user avatar
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252 votes
12 answers
373k views

A huge (up to 2 GiB) text file of mine contains about 100 exact duplicates of every line in it (useless in my case, as the file is a CSV-like data table). What I need is to remove all the repetitions ...
Ivan's user avatar
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138 votes
20 answers
361k views

I was wondering how to count the number of a specific character in each line by some text processing utilities? For example, to count " in each line of the following text "hello!" Thank you! The ...
Tim's user avatar
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220 votes
8 answers
45k views

This question is inspired by Why is using a shell loop to process text considered bad practice ? I see these constructs for file in `find . -type f -name ...`; do smth with ${file}; done and for ...
don_crissti's user avatar
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282 votes
3 answers
57k views

If you've been following unix.stackexchange.com for a while, you should hopefully know by now that leaving a variable unquoted in list context (as in echo $var) in Bourne/POSIX shells (zsh being the ...
Stéphane Chazelas's user avatar
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95 votes
9 answers
304k views

Is there an issue with sed and new line character? I have a file test.txt with the following contents aaaaa bbbbb ccccc ddddd The following does not work: sed -r -i 's/\n/,/g' test.txt I ...
Jim's user avatar
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58 votes
10 answers
24k views

I tried a bash script, but it took too long to create a simple 1 MB file. I think the answer lies in using /dev/random or /dev/urandom, but other posts here only show how to add all kinds of data to a ...
posixKing's user avatar
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115 votes
4 answers
162k views

I obviously understand that one can add value to internal field separator variable. For example: $ IFS=blah $ echo "$IFS" blah $ I also understand that read -r line will save data from stdin to ...
Martin's user avatar
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99 votes
5 answers
238k views

I have a string in the next format id;some text here with possible ; inside and want to split it to 2 strings by first occurrence of the ;. So, it should be: id and some text here with possible ; ...
gakhov's user avatar
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40 votes
16 answers
118k views

I want to convert all *.flac to *.mp3 in the specific folder. This is what I've tried, but not works: # change to the home directory cd ~/music # convert all *.flac files ffmpeg -i *.flac -acodec ...
Kevin Dong's user avatar
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93 votes
6 answers
337k views

Say I have this file: hello world hello world This program #!/bin/bash for i in $(cat $1); do echo "tester: $i" done outputs tester: hello tester: world tester: hello tester: world I'd like to ...
Tobias Kienzler's user avatar
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54 votes
8 answers
48k views

I have iterate over numbers in various order. I am able to display them in increasing order, even with steps like: $ seq --separator="," 1 10 1,2,3,4,5,6,7,8,9,10 $ seq --separator="," 1 2 10 1,3,5,7,...
mtk's user avatar
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43 votes
15 answers
29k views

Preface: I love bash and have no intention of starting any sort of argument or holy-war, and hopefully this is not an extremely naive question. This question is somewhat related to this post on ...
Robert S Ciaccio's user avatar
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