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Top Forums UNIX for Dummies Questions & Answers to extract all the part of the filename before a particular word in the filename Post 302692289 by aealexanderraj on Monday 27th of August 2012 11:09:31 AM
Old 08-27-2012
MySQL to extract all the part of the filename before a particular word in the filename

Hi All,
Thanks in Advance

I am working on a shell script. I need some assistance.

My Requirement:

1) There are some set of files in a directory like given below


OTP_UFSC_20120530000000_acc.csv
OTP_UFSC_20120530000000_faf.csv
OTP_UFSC_20120530000000_prom.csv
OTP_UFSC_20120530000000_subs.csv

I want to check if all thes files exists in the directory

the keywords are acc.csv, faf.csv, prom.csv, subs.csv
apart from this all the other things vary time to time (like the field seperator used in the file (can be.,-,_ etc) and the names OTP UFSC will vary.

2) if the file does not exist I have to touch (Create a empty file by that name)
Example : Imagine the file OTP_UFSC_20120530000000_acc.csv doesnot exist
in the directory
I have to search first if a file *acc.csv exist in the directory or not. If not i will extract the prefix (anything before acc.csv in this case OTP_UFSC_20120530000000_) from an existing file which is common to all the files in the directory
and create a file OTP_UFSC_20120530000000_acc.csv

Smilie
Any suggestions and help

Moderator's Comments:
Mod Comment Please do not cross-post. Thanks. Closed.
 

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nomarch(1)							Archive Extraction							nomarch(1)

NAME
nomarch - extract `.arc' archives SYNOPSIS
nomarch [-hlptUv] [archive.arc] [match1 [match2 ... ]] DESCRIPTION
nomarch lists, extracts, or tests `.arc' archives. (An alternate extension sometimes used was `.ark'; these work too.) This is a very out- dated file format which should certainly not be used for anything new, but you may still need an extraction utility, and here it is. :-) The default action is to extract all files in the specified archive; see OPTIONS below for how to do other things instead. OPTIONS
-h give terse usage help. -l list files in archive. If verbose listings are enabled, it shows the filename, compression method, compressed/uncompressed size, date/time, and CRC; but by default, it just shows the filename, uncompressed size, and date/time. -p extract to standard output, rather than to separate files. -t test files in archive (more precisely, check file CRCs). -U use uppercase filenames; more precisely, preserve original case from archive. -v give verbose output (when used with `-l'). archive.arc the archive to operate on. match1 etc. optionally specify which archive members to list/extract/test. Those which match any of these filenames/wildcards are processed. Wildcard operators supported are shell-like `*' and `?', but don't forget to quote arguments which use these (e.g. `nomarch foo.arc '*.bar''). EXTRACTING MULTIPLE ARCHIVES
nomarch follows the `unzip'-like practice of working on only one archive per run, with further `filenames' given on the command-line actu- ally specifying files to extract (or whatever). The easiest way to work on multiple files with nomarch is simply to run it multiple times using for; for example: for i in *.arc; do nomarch $i; done The above would extract all archives in the current directory. USING THE PROGRAM FROM EMACS
Emacs's arc-mode facility lets you work with various kinds of archive file directly from the editor. Making it use nomarch for extracting `.arc' files isn't too hard. Just add the following to your ~/.emacs file: (setq archive-arc-extract '("nomarch" "-U")) BUGS
The CRC used by the format is only 16-bit, so `-t' is a less-than-perfect test. One compression method, obsolete even by `.arc' standards :-), isn't supported yet. This is partly because I've yet to find a single file which uses it, despite testing an awful lot of files. Subdirectories in Spark archives are extracted as the `.arc'-format files they really are, which may not be terribly convenient. SEE ALSO
tar(1), gzip(1), bzip2(1), lbrate(1) AUTHOR
Russell Marks (rus@svgalib.org). Version 1.4 18th June, 2006 nomarch(1)
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