for loop parsing of ls and the magic behind * I know that the following is bad: for i in `ls -1 *.MOV` ;do … and that the proper syntax is for i in *.MOV ;do … But what are the mechanics behind it? I mean, what part of *.MOV tells the for command that …
bash: different behaviour of script and in terminal (loop over files) I’m trying to loop over files with having different searching conditions based on the folder which I used with a case statement. basically it’s: #!/bin/bash case folder in "Testordner") search_filename=*_0_*.txt ;; "Ordner2") search_filename=*_65_*fg*.txt ;; *) ;; esac for files in $search_filename; do echo $files …
How to run a loop inside sh -c I’m having trouble understanding what I need to escape when using sh -c. Let’s say I want to run the for loop for i in {1..4}; do echo $i; done. By itself, this works fine. If I pass it to eval, I need to escape the $: …
How to Store the Output of a for Loop to a Variable I have the following shell code: for value in 10 5 27 33 14 25 do echo $value done But what if I want to manipulate the output later? I want to store the entire output in one variable. Is this possible? Asked …
Looping through variables which is an output of another command Hello I am learning Scripting here. I am trying to write a simple script using the ‘for’ loop. I have hundreds of folders in a folder called user. if i run this command i get a list of folders that i need to move to …
Bash for loop with string var containing spaces In my directory I have two files with space, foo bar and another file. I also have two files without space, file1 and file2. The following script works: for f in foo bar another file; do file "$f"; done This script also works: for f in ‘foo …
Adding suffix to filename during for loop in bash This has probably been asked but the existing answers don’t make sense to me. I am running a loop over multiple CSV files in a folder. This folder has non-csv files also and hence I must specify the csv files explicitly. I am modifying the csv …
Renaming multiple files using a loop I need to rename some files using a loop but I can’t get it to work as I am still very new at Linux. the files that need to be renamed are: E9-GOWN33_multiplemap.bin.10.fa E9-GOWN33_multiplemap.bin.16.fa E9-GOWN33_multiplemap.bin.21.fa E9-GOWN33_multiplemap.bin.7.fa to a shorter name such as: E9.bin.10.fa E9.bin.16.fa E9.bin.21.fa E9.bin.7.fa I have used …
Vifm: run command on each selected file individually I want a for loop analog for Vifm. When I don’t select any file, I can type :!echo %f and I see the output of echo with the current file name as the argument. When I select several files, :!echo %f yields output of echo with all …
Bash: Multiple for loops in Background Is this the correct way to start multiple sequential processings in the background? for i in {1..10}; do for j in {1..10}; do run_command $i $j; done & done; All j should be processed after each other for a given i, but all i should be processed simultaneously. Asked …
How to convert an input parameter to integer value in a for loop in bash? in my bash script I try to use a number as an input variable for a for loop I run the script as ./script.sh InputFolder/ Number_of_iterations the script should work inside the given folder and run a for loop as …
Bash `sleep` outputs __bp_preexec_invoke_exec Background I’m running a larger one-line command. It is unexpectedly outputting (twice per iteration) the following: __bp_preexec_invoke_exec “$_” Here is the pared down command (removed other activity in loop): for i in `seq 1 3`; do sleep .1 ; done note: after i have played with this a few times it …
What happens when files are added/removed in the middle of a "for f in *" sh loop? I found one for loop example online. Now I want to use it in my code but I am not sure how does this loop operates for entry in “$search_dir”/* do echo “$entry” done Now I want to …
In what order does a bash FOR IN loop pick up files in a folder? Say I have a below for in loop: for i in /apps/textfiles/*.txt do do something done Now say I have 50 files inside /apps/textfiles/ In what order will the files be picked? Asked By: Koshur || Source Filename expansion in …
Loop through a folder and list files I have a folder named ‘sample’ and it has 3 files in it. I want to write a shell script which will read these files inside the sample folder and post it to an HTTP site using curl. I have written the following for listing files inside the …
Shell variables in a for loop I have a difficulty getting over this man bash passage. If the control variable in a for loop has the nameref attribute, the list of words can be a list of shell variables, and a name reference will be established for each word in the list, in turn, when …
Loop through files excluding directories I need my script to do something to every file in the current directory excluding any sub-directories. For example, in the current path, there are 5 files, but 1 of them is a folder (a sub-directory). My script should activate a command given as arguments when running said script. I.e. …
How do I get 0-padded numbers in {} (brace expansion)? I’m trying to write a simple script to retrieve memory and swap usage from a list of hosts. Currently, the only way I’ve been able to achieve this is to write 3 separate scripts: for a in {1..9}; do echo "bvrprdsve00$a; $(ssh -q bvrprdsve00$a "echo …
Why is looping over find's output bad practice? 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 dir in $(find . -type d -name …); do …
How do I replace AND (&&) in a for loop? I’d like to find an equivalent of cmd 1 && cmd 2 && … && cmd 20 but with commands expressed within a for loop like for i in {1..20} do cmd $i done What would you suggest to change in the second expression to …
