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Full Discussion: Command comparisons
Top Forums UNIX for Dummies Questions & Answers Command comparisons Post 302535577 by methyl on Friday 1st of July 2011 06:44:15 AM
Old 07-01-2011
Java

There are some funny quote characters here like it has come from a Windows editor. Also the "-name" parameter is missing.
Quote:
find . “*.log” | xargs grep ERROR
find . “*.log” –exec grep ERROR ‘{}’ \;
You probably mean:
Code:
find . -type f -name '*.log' | xargs grep "ERROR"
find . -type f -name '*.log' -exec grep "ERROR" {} \;

On many modern versions of "find" the "+" syntax is actually fastest of all:
Code:
find . -type f -name '*.log' -exec grep "ERROR" \+


Addendum:
Quote:
ls * | wc –w => this gives you the number of files in the current directory including all subdirectories
Sort of true. It does however exclude filenames starting with a period (e.g. .profile). It also sorts each directory to alphabetical order which is a bit of a waste if all you wanted to do was count them. It also gives an incorrect count if any filename contains a space character because you are counting "words". You also count directory files but because "including all subdirectories" is ambiguous it's hard to tell whether this is intentional.

Code:
This is a more efficient and accurate way to count every type of file (including directory files)
find . -print |wc -l
Or if your "find" allows the syntax:
find . | wc -l

Or if you just want to count all files:
find . -type f | wc -l


Last edited by methyl; 07-01-2011 at 08:10 AM..
 

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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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