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Full Discussion: CHECK SCRIPT SYNTAX
Top Forums Shell Programming and Scripting CHECK SCRIPT SYNTAX Post 302704315 by Corona688 on Friday 21st of September 2012 11:08:01 AM
Old 09-21-2012
xargs transforms text into arguments. These two commands are equivalent, for instance:

Code:
cat a b c
echo a b c | xargs cat

If you leave -exec off of find it just does its default action instead, which is, print every filename on a separate line. If you feed that into xargs commandname, it will run commandname with the filenames as arguments. If it's too many filenames to fit into one call, it will run commandname several times.

So, find without xargs:

Code:
find ... -exec something '{}' '+'

find with xargs:

Code:
find ... | xargs something

The version with -exec is preferable if you can, because spaces and quote-characters in filenames and paths can confuse xargs. -exec has no such problem, to the point that find is a useful tool for removing files which somehow ended up with humanly untypable names.

Last edited by Corona688; 09-21-2012 at 12:43 PM..
 

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FIND(1) 						      General Commands Manual							   FIND(1)

NAME
find - find files meeting a given condition SYNOPSIS
find directory expression EXAMPLES
find / -name a.out -print # Print all a.out paths find /usr/ast ! -newer f -ok rm {} ; # Ask before removing find /usr -size +20 -exec mv {} /big ; # move files > 20 blks find / -name a.out -o -name '*.o' -exec rm {}; # 2 conds DESCRIPTION
Find descends the file tree starting at the given directory checking each file in that directory and its subdirectories against a predi- cate. If the predicate is true, an action is taken. The predicates may be connected by -a (Boolean and), -o (Boolean or) and ! (Boolean negation). Each predicate is true under the conditions specified below. The integer n may also be +n to mean any value greater than n, -n to mean any value less than n, or just n for exactly n. -name s true if current filename is s (include shell wild cards) -size n true if file size is n blocks -inum n true if the current file's i-node number is n -mtime ntrue if modification time relative to today (in days) is n -links ntrue if the number of links to the file is n -newer ftrue if the file is newer than f -perm n true if the file's permission bits = n (n is in octal) -user u true if the uid = u (a numerical value, not a login name) -group gtrue if the gid = g (a numerical value, not a group name) -type x where x is bcdfug (block, char, dir, regular file, setuid, setgid) -xdev do not cross devices to search mounted file systems Following the expression can be one of the following, telling what to do when a file is found: -print print the file name on standard output -exec execute a MINIX command, {} stands for the file name -ok prompts before executing the command SEE ALSO
test(1), xargs(1). FIND(1)
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