Assign a value to a variable / parameter

gauravjain21 · #1 (**permalink**) 12-18-07, 21:36

In one directory, I've following files,

Filename:
DOC_CACA_PCHK_20071205.txt
DOC_CACA_PCHK_TRIGGER.trg

I want to to do the following;
1. retrieve CACA from *.trg
2. Pass the above value and look for CACA*.txt
3. Retrieve the date part from CACA*.txt, ie: 20071205

Now, I want a one line command only to handle this as I cannot have any external parameters.

PMASchmed · #2 (**permalink**) 12-28-07, 16:12

Don't have UNIX machine in front of me, and have not scripted for a while, but I think something like:

filename=DOC_CACA_PCHK_TRIGGER.trg
filename2=DOC_CACA_PCHK_20071205.txt
search= `ls ${filename} | cut -f2 -d"_"`
ls ${filename2} | grep ${search} | cut -f3 -d"_"

sorry, did not see the 1 line part before I wrote this.

radoulov · #3 (**permalink**) 12-28-07, 18:18

With zsh:

Code:

% ls -l                                                        
total 0
-rw-r--r-- 1 radoulov radoulov 0 2007-12-29 00:10 DOC_CACA_PCHK_20071205.txt
-rw-r--r-- 1 radoulov radoulov 0 2007-12-29 00:10 DOC_CACA_PCHK_TRIGGER.trg
% a=(*trg) a=(*${${(s:_:)a}[2]}*.txt);print ${${(s:_:)a}[4]%.*}
20071205

With bash and ksh93:

Code:

$ ls -l
total 0
-rw-r--r-- 1 radoulov radoulov 0 2007-12-29 00:10 DOC_CACA_PCHK_20071205.txt
-rw-r--r-- 1 radoulov radoulov 0 2007-12-29 00:10 DOC_CACA_PCHK_TRIGGER.trg
$ a=(*trg) set -- ${a//[_.]/ };a=(*$2*.txt);set -- ${a//[_.]/ };printf "%s\n" "$4"
20071205
# for fixed filename format
$ a=(*trg) set -- ${a//[_.]/ };a=(*$2*.txt);printf "%s\n" "${a:14:8}"
20071205
# or
$ a=(*trg) set -- *${a:4:4}*.txt;printf "%s\n" "${a:14:8}"
20071205

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