Re^2: Copying a list of files from a directory to a new directory

The -f - is redundant, AFAIK. Then, newer (at least GNU) tar has a -T option (or --files-from) which eliminates the need for xargs, and a -C option (or --directory) which eliminates the need for cd and the parentheses

This simplifies the script to

tar c -C source -T mylist.txt | tar xC dest
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(Tested with MinGW on Win7)

Of course, your script could be written right out of your head, while I had to open the man page for looking up the letter of that filelist option...

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Re^3: Copying a list of files from a directory to a new directory by roboticus (Chancellor) on Jul 21, 2018 at 20:27 UTC
soonix: Heh, heh! In fact, when I was writing that response, I thought that tar would have such an option. But after listing through the first three or so pages of the dox, I got tired of looking. Then I thought I'd just xargs to convert the file into a list of command-line arguments. I nearly wrote it as `cat mylist.txt \| xargs \| ...` but didn't want to earn another "useless use of cat" award, so I just used `xargs <mylist.txt` to do the task. After your response, I again looked at `man tar` and found the option ... on the thirteenth page! Since my terminal is 57 lines long, that seems a bit excessive. I'm thinking that the man page for tar ought to be rearranged a bit, as that sounds like an option that's generally useful, and there are quite a few options that seem to be much more specialized, and hence useful in fewer situations. (I've never needed --hole-detection or --check-device both of which are on page 4.) Now that I'm aware of -T, though, I'll hopefully remember it for the next time. ;^) ...roboticus When your only tool is tar, all problems look like you're gonna have to read "War and Peace", possibly several times.	[reply] [d/l] [select]

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Re^3: Copying a list of files from a directory to a new directory
by roboticus (Chancellor) on Jul 21, 2018 at 20:27 UTC

soonix:

Heh, heh! In fact, when I was writing that response, I thought that tar would have such an option. But after listing through the first three or so pages of the dox, I got tired of looking. Then I thought I'd just xargs to convert the file into a list of command-line arguments. I nearly wrote it as cat mylist.txt | xargs | ... but didn't want to earn another "useless use of cat" award, so I just used xargs <mylist.txt to do the task.

After your response, I again looked at man tar and found the option ... on the thirteenth page! Since my terminal is 57 lines long, that seems a bit excessive. I'm thinking that the man page for tar ought to be rearranged a bit, as that sounds like an option that's generally useful, and there are quite a few options that seem to be much more specialized, and hence useful in fewer situations. (I've never needed --hole-detection or --check-device both of which are on page 4.) Now that I'm aware of -T, though, I'll hopefully remember it for the next time. ;^)

...roboticus

When your only tool is tar, all problems look like you're gonna have to read "War and Peace", possibly several times.

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