Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Functions in a shell script
Top Forums Shell Programming and Scripting Functions in a shell script Post 302902757 by rbatte1 on Thursday 22nd of May 2014 06:15:37 AM
Old 05-22-2014
What sort of processing are you doing? If there are lots of files being read & re-read, that will cost time. If there are lots of calls to external programs (grep, cut, tr, sed, awk etc.) in loops, then that will cost time.

For example are you reading a 10,000 line input file and for each line you use grep to scan another large file or set of files for each one, then there may be a better way to re-work the logic of avoid repetitive calls.

Can you give us a logical description of what it does? Roughly how many lines does your function have? (excluding comments and blanks if you can)

Can you put some tracing in to see where it is spending most of it's time?



Robin
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Shell script functions

Simple shell script : date test_fn() { echo "function within test shell script " } on the shell prompt I run > . test Then I invoke the function on the command line as below : test_fn() It echos the line function within test shell script and works as expected. ... (5 Replies)
Discussion started by: r_subrahmanian
5 Replies

2. Shell Programming and Scripting

functions in c shell??

i've been told that c shell does not support functions/subroutines is that true? if not can somebody give me the basic syntax for creating a function. it would very much appreciated! thanks in advance (1 Reply)
Discussion started by: ballazrus
1 Replies

3. Shell Programming and Scripting

Functions in C-Shell

Hi All, I have a very long code called myfunction -> "if ..... else if .... else if ..end if " And i have several other codes which need to call the "myfunction" code. How can C-shell call a function "B]myfunction" ? Can any body give me an example ?? (1 Reply)
Discussion started by: Raynon
1 Replies

4. Shell Programming and Scripting

Calling shell functions from another shell script

Hi, I have a query .. i have 2 scripts say 1.sh and 2.sh 1.sh contains many functions written using shell scripts. 2.sh is a script which needs to call the functions definded in 1.sh function calls are with arguments. Can some one tell me how to call the functions from 2.sh? Thanks in... (6 Replies)
Discussion started by: jisha
6 Replies

5. Shell Programming and Scripting

Creating functions in shell script

hi friends, I am working with shell commands and all these works properly. Then i created a small function which includes these commands. Now the problem arises. When the commands are run by calling this fuction.it shows error. Why i am not able to run the unix command inside a function.... (1 Reply)
Discussion started by: gjithin
1 Replies

6. Shell Programming and Scripting

using library functions in shell script

hey guys, i made up a library file called common.lib so as to reuse the same code without typing it again. here is the code. its pretty basic . ## This is the second function compare() { file1 = $1 file2 = $2 cmp $file1 $file2 if then echo "comparison is possible"... (1 Reply)
Discussion started by: Irishboy24
1 Replies

7. Shell Programming and Scripting

Shell functions usage

Hi all, I have a doubt.. If we create shell functions through a script itself, can we use the same functions in command line also.. for example: $ cat a.sh ##### Functions function system_info { } function show_uptime { } (4 Replies)
Discussion started by: raghu.iv85
4 Replies

8. Shell Programming and Scripting

Shell functions mystery

so i noticed that when a shell script has a function defined in it, running "sh -x" on that shell script from the command line doesnt show what the function is doing. i like this. is there anyway for anyone to get around that? to be able to see exactly what a function or functions are doing? (4 Replies)
Discussion started by: SkySmart
4 Replies

9. Shell Programming and Scripting

Shell script to apply functions to multiple columns dynamically

Hello, I have a requirement to apply hashing algorithm on flat file on one or more columns dynamically based on header sample input file ID|NAME|AGE|GENDER 10|ABC|30|M 20|DEF|20|F say if i want multiple columns based on the header example id,name or id,age or name,gender and hash and... (13 Replies)
Discussion started by: mkathi
13 Replies

10. UNIX for Beginners Questions & Answers

How to find C programming functions using shell script?

I want to find c function definition with pattern with shell script by checking condition for each line: data_type functionname(param_list){ .... } I knew cscope or ctag is usable for this task, but if there any ways to do without using them. I am thinking of checking line condition... (3 Replies)
Discussion started by: cmdcmd
3 Replies

LEARN ABOUT MINIX

zgrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
All times are GMT -4. The time now is 01:08 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy