Bash by example

xargs

  • -I replace-str

    -i default is {} as replace-str

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    $ echo argument1 argument2 argument3 | xargs -I % sh -c 'echo %'
$ echo argument1 argument2 argument3 | xargs -I # sh -c 'echo #'
$ echo argument1 argument2 argument3 | xargs -i sh -c 'echo {}'
argument1 argument2 argument3

  • -n max-args

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    $ echo argument1 argument2 argument3 | xargs -n 1
argument1
argument2
argument3

for loop

  • in

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    $ export destination=/mnt/storage/
$ for folder in ./*;do 7zz a -mx0 $destination/$folder.7z $folder;done;

gawk

  • using regex group, add prefix and suffix

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    grep "file not in Local file system at /mnt/storage/courses" nohup.out | gawk 'match($0, /:\s(.*7z)/, ary) {print "\"webdav:/189cloud/courses/"ary[1]"\""}' | xargs -n 1 rclone delete