Re^4: passing pipes on the command line

in reply to Re^3: passing pipes on the command line
in thread passing pipes on the command line

Exactly. It's a very nice trick when you have a program that expects to read from a file, and has no facilities for reading from STDIN. A common example is diff:

diff <(grep foo file1 | sort -u) \
     <(grep foo file2 | sort -u)
[download]

Of course, we have rapidly veered off topic for the Monastery, so I digress. :-)

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Re^5: passing pipes on the command line by ambrus (Abbot) on Mar 23, 2005 at 21:03 UTC
Sure, it's very useful. Of course, diff can read one of its inputs from stdin, so you can use `grep foo file1 \| sort -u \| diff - <( grep foo file2 \| sort -u )` [download]	[reply] [d/l]

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