Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

How to compare two strings using if

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How to compare two strings using if
# 8  
Old 02-23-2010
Here's the revised code:

Code:
#!/bin/ksh
 
pick_typ="$1"
echo $pick_typ
 
 
if [ "$pick_typ" == "CUS" ] ||
   [ "$pick_typ" == "ORD" ] ||
   [ "$pick_typ" == "TRR" ]
then
  echo "inside if"
else
  echo "outside if"
fi

Last edited by Scott; 02-23-2010 at 02:38 PM.. Reason: Please use code tags
# 9  
Old 02-23-2010
a more flexible way with a loop:
Code:
for K in CUS ORD TRR
do	[ "$pick_typ" = $K ] && K=""
done
[ -z "$K" ] && echo "outside if" || echo "inside if"

# 10  
Old 02-23-2010
Hi.

The modern ksh and bash shells allow operator "=~" to do regular expression matching:
Code:
#!/usr/bin/env ksh

# @(#) s1	Demonstrate matching.

# Infrastructure details, environment, commands for forum posts. 
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo ; echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
c=$( ps | grep $$ | awk '{print $NF}' )
version >/dev/null 2>&1 && s=$(_eat $0 $1) || s=""
[ "$c" = "$s" ] && p="$s" || p="$c"
version >/dev/null 2>&1 && version "=o" $p
set -o nounset
echo

echo " Results:"
pick_typ="$1"
echo $pick_typ

# if [[ "$pick_typ" = "CUS" || "$pic_typ" = "ORD" || "$pic_typ" = TRR" ]];then
if [[ "$pick_typ" =~ CUS|ORD|TRR ]]
then
  echo "inside if"
else
  echo "outside if"
fi

exit 0

which, when driven by script s2:
Code:
#!/usr/bin/env ksh

# @(#) s2	Drive working script s1 with parameters.

./s1 CUS
./s1 ORD
./s1 TRR
./s1 junk

exit 0

produces:
Code:
% ./s2

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
ksh 93s+

 Results:
CUS
inside if

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
ksh 93s+

 Results:
ORD
inside if

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
ksh 93s+

 Results:
TRR
inside if

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
ksh 93s+

 Results:
junk
outside if

See man ksh, search for "==" to see details ... cheers, drl
# 11  
Old 02-23-2010
Well spotted anbu23 !

@bhargav23 . It is advisible to not call a script the same name as a unix command.
If the following command for a script called "scriptname" finds a program or a shell builtin, try another name.

Code:
type scriptname

# 12  
Old 02-23-2010
Quote:
Originally Posted by drl
The modern ksh and bash shells allow operator "=~" to do regular expression matching:
[...]
... and zsh.
This User Gave Thanks to radoulov For This Post:
drl
# 13  
Old 02-24-2010
Thanks a lot it worked fine.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Ubuntu

Compare 2 strings

I think there is a way to detect mouse movement. valuator changes if the mouse moves. So I need to compare the two strings. Not sure how to do that. How could I send the valuator string to a file ? I would need to do it twice. andy@7_~/Downloads$ xinput query-state 9 2 classes :... (7 Replies)
Discussion started by: drew77
7 Replies

2. UNIX for Beginners Questions & Answers

If statement to compare two strings

Hi, I am trying to do the following to see if "ip" is already present in a file. if ; then echo "hi" else echo "hello" fi I am seeing errors on the if statement. Can someone please correct the syntax for me? Thanks (2 Replies)
Discussion started by: waince
2 Replies

3. Shell Programming and Scripting

Compare 2 Strings

I have 2 values V_1_4_4_b1 and V_1_5_1_RC_b1. I would need to compare them and determine if the 1st value is greater, less or equal than the 2nd value. The result should need to have a return value. I have below code in bash function but it seems it is not comparing it correctly. Any help will... (8 Replies)
Discussion started by: aderamos12
8 Replies

4. Shell Programming and Scripting

Compare strings with space in if statement

DEV> vi test_if_statement.sh "test_if_statement.sh" 9 lines, 205 characters proc_out="Normal completion" proc_out_comp="Normal completion" echo 'proc_out:'$proc_out echo 'proc_out_comp:'$proc_out_comp if then echo 'match' else echo 'no_match' fi ~ ~ ~ ~ ~ ~ ~ ~ ~ (4 Replies)
Discussion started by: cartrider
4 Replies

5. Shell Programming and Scripting

How to compare two strings in a file

hello guyzz please help me out.. I have two file a.sh and b.sh it contains two string SD109 ,SD108 . I want to compaere these two string . If a.sh>b.sh do rebasing record time. else it shows no rebasing required. Thanks. (2 Replies)
Discussion started by: abhijtr
2 Replies

6. Shell Programming and Scripting

Compare two strings

hi.. i have a problem to compare two string my code is like that if ] then echo "both data are correct" elif ] echo "data is wrong" fi here $username1 is taking value from file.. (7 Replies)
Discussion started by: shubhig15
7 Replies

7. Shell Programming and Scripting

How to Compare 2 Strings ?

Hello , I want to Compare with 2 strings and get if they are True or not please would like some help on this #!bin/ksh echo "Enter Name 1" read Name1 echo "Enter Name 2" read Name2 echo "------------------------" echo "First Name: $Name1" echo "Second Name: $Name2" echo... (25 Replies)
Discussion started by: shatztal
25 Replies

8. Shell Programming and Scripting

Compare text strings.

Hi Im trying to write a script that compare a text string. But it fails, I think it adds a extra line feed to the result and fails beacuse of that. The script. DT=`date +'%Y%m%d%H%M%S'` #ALARM_BIN=/users/alarms/ssa/alarms/bin QUEUE_THR=10 #unset offset #offset="***Server reports data... (3 Replies)
Discussion started by: vettec3
3 Replies

9. Shell Programming and Scripting

How to compare two strings

Hi all, I am trying to compare two strings/dates, but its throwing error::Syntax error at line 5: Please help !! Any alternate way to compare two dates is also fine.... logdate1=`date -u '+%Y.%m.%d %T'` sleep 5 logdate2=`date -u '+%Y.%m.%d %T'` if test... (5 Replies)
Discussion started by: prashant43
5 Replies

10. Shell Programming and Scripting

to compare two strings

hi all, i am new to unix. Actually i need to compare two string and print the result... suppose type='sun' if; then echo good morning else echo good night fi whether the comparison is right r we need to use eq???? help me please.... :confused: thanks in advance.... (1 Reply)
Discussion started by: ithirak17
1 Replies
Login or Register to Ask a Question