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I created a folder on my home directory call junk, and let's say I want to move all .cpp and .h files to it. How would I do it? My first thought is to start with find ~ -name *.cpp -print, but I don't know how to put in multiple patterns into the find argument, and I'm fairly lost after that.

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2 Answers 2

portably:

cd &&
  find . -path ./junk -prune -o -type f \( \
    -name '*.h' -o -name '*.cpp' \) -exec sh -c '
      exec mv -i "$@" junk' sh {} +

Above excluding the junk folder itself from the search.

We're only removing regular files (-type f). There may be other types of files you want to move like symlinks, but beware that moving symlinks often break them.

The -i is a safeguard to avoid two files with the same name overriding each other.

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please once check my updated answer, I think I have wrongly explain regex part –  Rahul Patil Feb 8 at 11:57
    
Could you please explain the extra calls to sh? As opposed to for instance find . ! -path './junk/*' -type f \( -name '*.h' -o '*.cpp' \) -exec mv -i "{}" ./junk/ \; –  grebneke Feb 8 at 12:12
    
@grebneke, mv -i {} junk \; would run one mv per file. Using + means pass as may files as possible. You need sh to be able to have a junk argument after that list. With GNU or FreeBSD mv, you could have done -exec mv -it junk {} + instead. –  Stéphane Chazelas Feb 8 at 12:43
    
@StephaneChazelas - I see, but there are two sh, what does the second one do sh {} +? –  grebneke Feb 8 at 13:13
    
@grebneke, the first argument after sh -c code is for $0 (used for error messages...), "$@" starts after. –  Stéphane Chazelas Feb 8 at 14:44
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If on a GNU system, you can use the -regex option to find as shown below:

find . -regex ".*\.\(h\|cpp\)" -exec echo mv -v "{}" ~/junk \;

the output will show which command would be executed, like a dry run. If that looks good, you can remove the echo for applying.

Command Break Down

  • -regex : File name matches regular expression pattern, the default regex type it's uses emacs
  • ".*\.\(h\|cpp\)" : Since it's uses default regex type emacs, as per pattern match . (dot) means matches any character so to match exact . ( dot), we have to use escape character that is \. means for special character like (, | we have to use escape character. the pattern same as .*.(h|cpp) (regextype posix-egrep )
  • -exec : Execute command
  • { } : The string { } replaced by the matches file name
  • \; : Needs to be there as it tells the end of arguements provided to -exec variable

For more information on regular expression you can refer

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can you break down what ".*\.(h\|cpp)" means? I'm a beginner so I'm completely lost. –  Jonathan Chiou Feb 8 at 11:33
    
@JonathanChiou See the updated answer.. –  Rahul Patil Feb 8 at 11:50
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