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Size: 1208
Comment: Clarify -m, mention preference for -X. parallel w/ file of arguments.
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Size: 1286
Comment: Faster parallel copy
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| Deletions are marked like this. | Additions are marked like this. |
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| find . -maxdepth 1 -mindepth 1 -print0 | parallel -q0 -j4 echo cp -avn {} $dst | parallel --bar -j4 cp -avn -- "{}" "$dst" ::: * # Old idea, much slower find . -maxdepth 1 -mindepth 1 -print0 | parallel -q0 -j4 echo cp -avn "{}" "$dst" |
1 # Parallel copy
2 # Because we are copying the current directory, make sure $dst is correct
3 parallel --bar -j4 cp -avn -- "{}" "$dst" ::: *
4 # Old idea, much slower
5 find . -maxdepth 1 -mindepth 1 -print0 | parallel -q0 -j4 echo cp -avn "{}" "$dst"
6
7 # Check MP3s in parallel, many arguments per invocation
8 parallel -X mp3check -Sqe ::: *mp3
9
10 # Run commands in a file parallel
11 parallel < commands.txt
12
13 # Using a file (one per line) of arguments
14 parallel 'some-command {}' ::: list-of-arguments.txt
15
16 # Parallel equivalent of
17 # `find $DIRECTORY -type f -exec sha1sum '{}' \; > $DIRECTORY.sha1`
18 find $DIRECTORY -type f -print0 | parallel -q0 -k sha1sum > $DIRECTORY.sha1
19
20 # Quickly get hash of large file. Reads in 1G chunks, multiple CPUs, and outputs 1 hash.
21 parallel --block=1G --pipepart -a $LARGE_FILE --progress --recend '' -k sha1sum | sha1sum
-X: Multiple arguments per job, spread evenly across jobs, with context replace to replace "{}".
-m: Multiple arguments per job, spread evenly across jobs. Preferably use -X.
--xargs: Multiple arguments per job emulating xargs behavior; as many arguments per job as possible
-n: Limits number of arguments per job, use w/ -X, --xargs, or -m
