Sponsored Content
Full Discussion: How to write if loop in unix
Top Forums UNIX for Dummies Questions & Answers How to write if loop in unix Post 302128611 by Shell_Life on Wednesday 25th of July 2007 04:46:43 PM
Old 07-25-2007
Pinky,
Your 'if' statement is not clear on to what type the variables x,y,z,a,b are.

It makes a difference if they are string or numeric.

Numeric:
Code:
x=1
y=1
z=3
a=9
b=8
if [ $x -eq $y -o \( $y -eq $z -a $a -eq $b \) ]; then
 echo "FOUND NUMERIC"
else
 echo "NOT FOUND NUMERIC"
fi

Alphanumeric:
Code:
X='A'
Y='A'
Z='C'
A='M'
B='N'
if [ "$X" = "$Y" -o \( "$Y" = "$Z" -a "$A" = "$B" \) ]; then
 echo "FOUND CAPITAL ALPHA"
else
 echo "NOT FOUND CAPITAL ALPHA"
fi

 

10 More Discussions You Might Find Interesting

1. Programming

how to write c codes in UNIX

Sorry for asking a very basic question. How do i compile my c codes in UNIX. That is how do i know whether any c compiler is there in my system? If nothing is present where from do i get one and load into my system? (12 Replies)
Discussion started by: rraajjiibb
12 Replies

2. Shell Programming and Scripting

trying to write a script to loop through a port info file

Below is part of a script i have written to loop through part of a port info file. How do i continue the script to get info for OS Device Name, manufacturer and then put information into an array? HBA Port WWN: 10000000c9420b4b OS Device Name: /dev/cfg/c10 Manufacturer: Emulex... (5 Replies)
Discussion started by: rcon1
5 Replies

3. Shell Programming and Scripting

How to write a If loop..

Hi all.. I've written a script which reads all system backup information. #!/bin/ksh export ORACLE_SID=$1 export primaryhost=$2 export sid=`echo $ORACLE_SID| tr ` RESULTFILE=/oracle/PC9/backupstatus_prod.log ssh -l ora${sid} ${primaryhost} "tail -1... (2 Replies)
Discussion started by: suri.tyson
2 Replies

4. Shell Programming and Scripting

Need to write a script to reformat a file in unix but not familiar with unix

unix script must do the fiollowing open a file containing comma delimited records > each record contains 10 fields > removes the 2nd field and use that same field containing fields 2 to 10 the original record after fprocessing should containing fields 1 and 3 a new erecord must be... (10 Replies)
Discussion started by: dwightja
10 Replies

5. Shell Programming and Scripting

Push records to array during implicit loop and write to file

NEWBIE ALERT! Hi, I'm 1 month into learning Perl and done reading "Minimal Perl" by Tim Maher (which I enjoyed enoumously). I'm not a programmer by profession but want to use Perl to automate various tasks at my job. I have a problem (obviously) and are looking for your much appreciated help.... (0 Replies)
Discussion started by: jospan
0 Replies

6. IP Networking

read/write,write/write lock with smbclient fails

Hi, We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the... (1 Reply)
Discussion started by: swatidas11
1 Replies

7. UNIX for Dummies Questions & Answers

Unable to write to a file within a loop

Hi All, Following is the program that i have written in cygwin. The redirection of the unfound $param1 to error.txt file doesnt work.Can any one help? #!/usr/bin/sh fname=$1 sed 's/ //g' "$fname" > fname1 while read i do echo $i > file1 #param1 is script name ... (1 Reply)
Discussion started by: janardhanamk
1 Replies

8. Shell Programming and Scripting

how to write for loop

Hi All, I have one variable "TABLE_LIST" having the values and each valeus i can run in for loop like below: TABLE_LIST= abc,abcd,acbfd i should write the for loop and use each value at a time . Please help me Thanking in advance .............. Regards, Dathu (4 Replies)
Discussion started by: pdathu
4 Replies

9. UNIX for Dummies Questions & Answers

Write a while loop inside for loop?

I'm taking a unix class and need to countdown to 0 from whatever number the user inputs. I know how to do this with a while or until loop but using the for loop is throwing me off.... I know I can use an if-then statement in my for loop but can I include a while loop in my for loop? (3 Replies)
Discussion started by: xxhieixx
3 Replies

10. UNIX for Beginners Questions & Answers

How to write a Boolean variable which succeed and failed inside the if loop in shell script ?

I have if loop with multiple variable value check in if loop. How can i print only if loop satisfied variable and its value in shell script ? I dont want to check each variable in if loop. That makes my script larger. if ] then echo "Only satisfied variable with value" ... (3 Replies)
Discussion started by: prince1987
3 Replies
echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
All times are GMT -4. The time now is 02:46 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy