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I coded like below:

$ find . -maxdepth 1 -name '*.jpg' | head -n 100 | xargs -0 {} cp {} /home/rachael/backup

Error showed:

xargs: {}: No such file or directory

What's wrong with my code and how can it fixed?

2

steeldriver pinpoints some of the issues with your command, but I just wanted to add a shorter solution using the zsh shell (as the question was not specific to any one shell):

cp -- *.jpg(.[1,100]) ~rachel/backup

This would copy the 100 first (by lexicographic ordering) regular files in the current directory that matches the globbing pattern *.jpg.

For the 100 oldest files by modification timestamp, use *.jpg(.Om[1,100]), and use a lower-case o instead of O to get the 100 most recently modified files. Use n in place of Om to get numeric sorting of the filenames, and add D to also match hidden names.

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  • Which also has the benefit of copying the file in a consistent order (see also the the n glob qualifier to use a numeric order as jpg files tend to have numbers in them). See also the D glob qualifier to also consider hidden jpg files or jpg files in hidden directories (like find does by default). Sep 16 '19 at 11:51
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A couple of things:

  1. You're missing a -I in your xargs command to tell it what the {} is to be used for

  2. The -0 tells xargs to expect null-delimited input, but you're passing it newline-delimited input

So

find . -maxdepth 1 -name '*.jpg' -print0 | head -zn 100 | xargs -0 -I{} cp {} /home/rachael/backup

If you have the GNU version of cp, you might want to use the alternate form

find . -maxdepth 1 -name '*.jpg' -print0 | head -zn 100 | xargs -0 cp -t /home/rachael/backup
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  • 1
    +1. depending on what OP meant by "first" 100 files, it may also be worthwhile inserting a | sort -V -z before the | head -zn 100.
    – cas
    Sep 16 '19 at 6:01

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