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Old 04-28-2009, 10:52 PM   #1
Registered: May 2005
Location: St. Louis, MO
Distribution: CentOS6
Posts: 267

Rep: Reputation: 58
Does bash shell parameter expansion run the risk of overflowing command line buffer?

In a bash shell, does parameter expansion happen on the command line or in within the bash processing?
I have a line in a shell that contains:
chmod -x $(find $BASE_DIR/ -type f |tee $BASE_DIR/FileManifest)

and FileManifest turns out to be 32K in length.

I changed it to be:
find $BASE_DIR/ -type f |tee $BASE_DIR/FileManifest| while read file; do chmod -x $file; done
because I was concerned the parameter expansion may cause buffer overflow.
Was I wrong to be concerned?

Last edited by david1941; 04-28-2009 at 10:56 PM. Reason: premature posting while attempting to insert code tags
Old 04-28-2009, 11:13 PM   #2
Registered: May 2005
Location: St. Louis, MO
Distribution: CentOS6
Posts: 267

Original Poster
Rep: Reputation: 58
Oops! I mean "command substitution", not "parameter expansion" as I wrote. $(command)




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