Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: BASH: File name part to list reference problem.
Top Forums Shell Programming and Scripting BASH: File name part to list reference problem. Post 302441623 by agama on Sunday 1st of August 2010 11:07:10 PM
Old 08-02-2010
Yes, it looks like some of your problem is your loop structure. The while loop is capturing the last record from your text file and comparing that against the file name component. I would guess that you want the filename, or some part of the filename, compared to the information in each line of the text file until you find a match.

It's not efficient, but the logic below might do what you need.

Code:

for f in $(ls *.jpg)
do
        suss off filename data from f

        while read buf
        do
                if filename data == desired field in buf
                then
                        echo what you need
                        break                   # exit while
                fi
        done <data_file
done

I couldn't tell from your code whether the filenames had the suffix tacked onto the end (picture.jpgxxxx) or picture.xxxx.jpg. The ls command implies the latter, but you seem to be stripping off xxxx as the trailing 4 characters. You might be getting tripped up with this too. If you post a sample of filenames and a sample of your text file, it'd make giving suggestions a bit easier.


Nitpicking now.... the statement

Code:
souse=$(echo $line)

can be written more simply:

Code:
souse="$line"

This is easier to read, and depending on the shell it more efficient. There might also be ways to make sussing the field data from the text file more efficient; using external processes like 'cut' introduce overhead that can eat your lunch as far as performance is concerned.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

BASH: Grepping/sedding/etc out part of a file... (from one word to 'blank' line)

I have a file that lists data about a system. It has a part that can look like: the errors I'm looking for with other errors: Alerts Password Incorrect Login Error Another Error Another Error 2 Other Info or, just the errors I need to parse for: Alerts Password Incorrect ... (9 Replies)
Discussion started by: elinenbe
9 Replies

2. Shell Programming and Scripting

How to select or make reference to, part of a field

For a field format such as AAL1001_MD82, how do I select(and use in if statement) only the last four elements( in this case MD82) or the first three elements (in this case AAL)? For instance, how do I do the following - if first three elements of $x == yyy, then ... (5 Replies)
Discussion started by: akshaykr2
5 Replies

3. Shell Programming and Scripting

Array reference problem

i have a variable MYHOST that has my host name.depending on the host i have an array like A_<hostname>.Everytime i need to append the hostname to A_ to get the array.but in the shell script i am nt able to access the members of that array. code of what i hav done: export temp=A_$MYHOST for... (15 Replies)
Discussion started by: niteesh_!7
15 Replies

4. Shell Programming and Scripting

BASH - Reference external variable name dynamically

Hi there, I have included an external properties file into my BASH script via the 'source' command. I am attempting to dynamically assign a variable in the BASH script, that references the variable name within the external properties file i.e. #!/bin/bash pth=${0%/*} source... (3 Replies)
Discussion started by: mjwoodford
3 Replies

5. Shell Programming and Scripting

Replace character based on reference file problem asking

I got two files right now, input file (target file), reference file 1 (query file) reference file 1 (long list of data) KOLOPWMOPOPO ADASDASD ADSASDASDAD . . target file (one long liner content) ADASDASDTYUKOKOLOPWMOPOPOOPLUAADSASDASDADPOPOUYADADASDASD desired output file content ... (1 Reply)
Discussion started by: patrick87
1 Replies

6. Shell Programming and Scripting

Help with rename header content based on reference file problem

I got long list of reference file >data_tmp_number_22 >data_tmp_number_12 >data_tmp_number_20 . . Input file: >sample_data_1 Math, 5, USA, tmp SDFEWRWERWERWRWER FSFDSFSDFSDGSDGSD >sample_data_2 Math, 15, UK, tmp FDSFSDFF >sample_data_3 Math, 50, USA, tmp ARQERREQR . . Desired... (7 Replies)
Discussion started by: perl_beginner
7 Replies

7. Shell Programming and Scripting

symbol list reference

Can anyone direct me to a page that holds a list of perl's built in symbols? Example: $_ means blah $? means blah2 $! means blah3 (3 Replies)
Discussion started by: mrwatkin
3 Replies

8. Programming

Passing Pointers by reference in C++ Problem

Hello All, I am having this issue...where I am actually having hard time understanding the problem: The code is as follows: #include<iostream.h> void fxn(char*** var) { int i =4; *var = (char**)malloc(i*sizeof(char*)); for(int j =0; j<4; j++) { *var = "name"; cout<<*var;... (6 Replies)
Discussion started by: mind@work
6 Replies

9. Shell Programming and Scripting

Shell Scripting Problem - Invalid Back Reference

Here is the question... Create a new script, sub2, taking three parameters... 1.) the string to be replaced 2.) the string with which to replace it 3.) the name of the file in which to make the substitution ...that treats the string to be replaced as plain text instead of as a regular... (1 Reply)
Discussion started by: johnhisenburg
1 Replies

10. Shell Programming and Scripting

Bash compare a list of file

Dear all, I believe this is a Bash basic question... I am bit ashamed for asking actually... I want to create a Bash script that compares 2 different folders: 1) work_folder and 2) work_folder.git #!/bin/bash FOLDER_NAME=`pwd | awk -F/ '{ print $NF }' | awk -F. '{ print $1 }'` ... (6 Replies)
Discussion started by: freddie50
6 Replies

LEARN ABOUT DEBIAN

rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a file name containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)
All times are GMT -4. The time now is 12:54 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy