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Top Forums Shell Programming and Scripting Copy text and create new file Post 302944294 by bakunin on Monday 18th of May 2015 02:21:23 PM
Old 05-18-2015
Quote:
Originally Posted by cmccabe
I mis-spoke in my original post, there is no file.txt rather ~500 files all listed in a directory.
Files are just "frozen processes", as the saying goes. The following is based on balajesuri's suggestion:

Code:
ls | sed 's/\(^[^_]*_[^_]*\)_.*/\1.txt/' | uniq > output.txt

Before you ask, because i have the suspicion that in fact you want to rename the files listed that way:

Code:
ls | sed 's/\(^[^_]*_[^_]*\)_.*/& \1.txt/' |\
while read SRC TGT ; do
     mv "$SRC" "$TGT"
done

A similar solution based on Akshay Hedge's solution is equally possible and left as an exercise to the reader.

I hope this helps.

bakunin
 

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GLOB(3) 								 1								   GLOB(3)

glob - Find pathnames matching a pattern

SYNOPSIS
array glob (string $pattern, [int $flags]) DESCRIPTION
The glob(3) function searches for all the pathnames matching $pattern according to the rules used by the libc glob() function, which is similar to the rules used by common shells. PARAMETERS
o $pattern - The pattern. No tilde expansion or parameter substitution is done. o $flags - Valid flags: o GLOB_MARK - Adds a slash to each directory returned o GLOB_NOSORT - Return files as they appear in the directory (no sorting). When this flag is not used, the pathnames are sorted alphabetically o GLOB_NOCHECK - Return the search pattern if no files matching it were found o GLOB_NOESCAPE - Backslashes do not quote metacharacters o GLOB_BRACE - Expands {a,b,c} to match 'a', 'b', or 'c' o GLOB_ONLYDIR - Return only directory entries which match the pattern o GLOB_ERR - Stop on read errors (like unreadable directories), by default errors are ignored. RETURN VALUES
Returns an array containing the matched files/directories, an empty array if no file matched or FALSE on error. Note On some systems it is impossible to distinguish between empty match and an error. CHANGELOG
+--------+--------------------+ |Version | | | | | | | Description | | | | +--------+--------------------+ | 5.1.0 | | | | | | | | | | GLOB_ERR was added | | | | +--------+--------------------+ EXAMPLES
Example #1 Convenient way how glob(3) can replace opendir(3) and friends. <?php foreach (glob("*.txt") as $filename) { echo "$filename size " . filesize($filename) . " "; } ?> The above example will output something similar to: funclist.txt size 44686 funcsummary.txt size 267625 quickref.txt size 137820 NOTES
Note This function will not work on remote files as the file to be examined must be accessible via the server's filesystem. Note This function isn't available on some systems (e.g. old Sun OS). Note The GLOB_BRACE flag is not available on some non GNU systems, like Solaris. SEE ALSO
opendir(3), readdir(3), closedir(3), fnmatch(3). PHP Documentation Group GLOB(3)
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