Sponsored Content
Top Forums Shell Programming and Scripting New to Shell Scripting: Need help interpreting example function Post 302975651 by RudiC on Thursday 16th of June 2016 10:22:50 AM
Old 06-16-2016
As glad as we are to help, please consider reading man pages, e.g. man bash/ksh/your shell, to help yourself; those are immense sources of knowledge...!

1) man bash:
Quote:
test expr
If the first argument is ! , the result is the negation of ...
so: if ! means if NOT

2) man regex:
Quote:
A (modern) RE is one(!) or more nonempty(!) branches, separated by '|'
so (^|:)$1($|:) means $1 enclosed in : or at the begin-of-line ( ^ ) or at the end-of-line ( $ )...
This User Gave Thanks to RudiC For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Can't stop shell interpreting special characters

I am struggling with the following sample code: array1=(a b c d) array2=(* * * *) print ${array1} print ${array2} It returns 'c' and the name of a file in the directory I'm in. I can't for the life of me work out how to prevent the shell interpreting the '*' and just get it to return... (2 Replies)
Discussion started by: Doug97
2 Replies

2. Shell Programming and Scripting

Function loading in a shell scripting like class loading in java

Like class loader in java, can we make a function loader in shell script, for this can someone throw some light on how internally bash runs a shell script , what happenes in runtime ... thanks in advance.. (1 Reply)
Discussion started by: mpsc_sela
1 Replies

3. Shell Programming and Scripting

Sed function is shell scripting

Hello everybody, I trying to convert a text inside my file that looks something like this: into hyperlink so that the user can click onto it..... I tried this but doesn't work cat mylist9.html |sed -e '<a href="' >mylist13.html Thanks (13 Replies)
Discussion started by: kev_1234
13 Replies

4. Shell Programming and Scripting

Insert a function in a jsp file using Shell scripting

Greetings to all.I am new to the forum as well as to UNIX as well.I have a jsp file which has the following selectedStartMonth = request.getParameter( "startMonth" ); selectedStartDay = request.getParameter( "startDay" ); selectedStartYear = request.getParameter( "startYear" );... (3 Replies)
Discussion started by: 20033716
3 Replies

5. Shell Programming and Scripting

Need help interpreting a function

Hi, i was reading through a sample coding and came across this function, can anyone pls help to interpret the code for me. Thank alot find_lines() { res=-1 if ; then grep -i "$@" $FILENAME res=$? fi return $res } (2 Replies)
Discussion started by: Cheranime
2 Replies

6. Shell Programming and Scripting

/usr/bin/time Shell Scripting Function

Hello, I have made a Linux Shell Script that downloads 6 files from the Internet and then deletes them. Now i want to use the function "/usr/bin/time" and "bc" to calculate how long the avergate run time for the shell script is. I therefore need to do it 100 times. My shell script code is below: ... (6 Replies)
Discussion started by: solo2
6 Replies

7. UNIX for Dummies Questions & Answers

Interpreting Shell Script errors when called from CRON

Hi All, I am calling a series of shell scripts via CRON so everything is running as root. However, in my error log file I am seeing the following errors. Please can anyone offer any advise as to the possible causes and solution to prevent the errors from appearing. The Error 1227 seems to... (2 Replies)
Discussion started by: daveu7
2 Replies

8. Shell Programming and Scripting

Shell Scripting Function call return value

Hi I have a function : Make_Report() { trx_report=`sqlplus -s $conn_str << @@ set echo off; set pages 0; set feedback off; set verify off; select srv_trx_s_no,... (1 Reply)
Discussion started by: neeraj617
1 Replies

9. Shell Programming and Scripting

Mail function in shell scripting

Hi Guys, i'm new to scripting, please help me to write the script. Purpose: To write a simple addition program and to mail the output result. Script: #!/bin/bash echo "entr numbers"; read n1; read n2; answer=$(($n1+$n2)); echo $answer > mail -s "output" karthic324n@gmail.com; ... (4 Replies)
Discussion started by: Karthick N
4 Replies

10. Shell Programming and Scripting

Need help to write a function in shell scripting to execute sql files

Hi, I am new to shell scripting and i need to write a automation script to execute sql files. I need to check the table if it is there in system tables and need to write a function to call the .sql files. For ex. I have a.sql,b.sql,c.sql files, where the sql file contains DELETE and INSERT... (1 Reply)
Discussion started by: Samah
1 Replies
exit(1)                                                            User Commands                                                           exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
All times are GMT -4. The time now is 02:16 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy