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Top Forums UNIX for Dummies Questions & Answers FIND command question revisited Post 302222007 by Annihilannic on Tuesday 5th of August 2008 07:48:17 PM
Old 08-05-2008
When grep is supplied with multiple files to search it outputs the filename followed by a colon on the beginning of every matched line. Appending /dev/null to the command enforces this behaviour, even when only one file is actually searched.

xargs is a much more efficient way of doing this as it supplies grep with multiple filenames at a time, causing fewer invocations:

Code:
find / -name "*.sh" -type f  | xargs grep -l batch > batch_find.txt

 

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FIND(1) 						      General Commands Manual							   FIND(1)

NAME
find - find files SYNOPSIS
find pathname-list expression DESCRIPTION
Find recursively descends the directory hierarchy for each pathname in the pathname-list (i.e., one or more pathnames) seeking files that match a boolean expression written in the primaries given below. In the descriptions, the argument n is used as a decimal integer where +n means more than n, -n means less than n and n means exactly n. -name filename True if the filename argument matches the current file name. Normal Shell argument syntax may be used if escaped (watch out for `[', `?' and `*'). -perm onum True if the file permission flags exactly match the octal number onum (see chmod(1)). If onum is prefixed by a minus sign, more flag bits (017777, see stat(2)) become significant and the flags are compared: (flags&onum)==onum. -type c True if the type of the file is c, where c is b, c, d or f for block special file, character special file, directory or plain file. -links n True if the file has n links. -user uname True if the file belongs to the user uname (login name or numeric user ID). -group gname True if the file belongs to group gname (group name or numeric group ID). -size n True if the file is n blocks long (512 bytes per block). -inum n True if the file has inode number n. -atime n True if the file has been accessed in n days. -mtime n True if the file has been modified in n days. -exec command True if the executed command returns a zero value as exit status. The end of the command must be punctuated by an escaped semi- colon. A command argument `{}' is replaced by the current pathname. -ok command Like -exec except that the generated command is written on the standard output, then the standard input is read and the command executed only upon response y. -print Always true; causes the current pathname to be printed. -newer file True if the current file has been modified more recently than the argument file. The primaries may be combined using the following operators (in order of decreasing precedence): 1) A parenthesized group of primaries and operators (parentheses are special to the Shell and must be escaped). 2) The negation of a primary (`!' is the unary not operator). 3) Concatenation of primaries (the and operation is implied by the juxtaposition of two primaries). 4) Alternation of primaries (`-o' is the or operator). EXAMPLE
To remove all files named `a.out' or `*.o' that have not been accessed for a week: find / ( -name a.out -o -name '*.o' ) -atime +7 -exec rm {} ; FILES
/etc/passwd /etc/group SEE ALSO
sh(1), test(1), filsys(5) BUGS
The syntax is painful. FIND(1)
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