Help with String Comparison


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Help with String Comparison
# 1  
Old 04-23-2009
Help with String Comparison

I'm running the following script to compare string values to a regexp:

Code:
for entry in $(lpinfo -v | cut -c 1-); do
    if [$entry == socket://*]
      then
        echo "blah"
      continue
    fi
done

Whenever I run it, each token of lpinfo is being interpreted as a command and I get errors such as:

[network: command not found
[socket: command not found

How can I get bash to interpret this as just a string comparison and not me trying to call tons of undefined functions?

Any help is much appreciated.
# 2  
Old 04-23-2009
What happens when you do this:

Code:
if [ "$entry" = "socket://*" ]

# 3  
Old 04-24-2009
Yep, that did it. I didn't know you had to have a space between the brackets and the operations on the inside. Also, I had to do a double bracket test to make the evaluation interpret the right side as a regexp. So:

Code:
if [[ $entry == socket://* ]]

Thanks for the help.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk string comparison unterminated quoted string andrule of thumb

I have the logic below to look up for matches within the columns between the two files with awk. In the if statement is where the string comparison is attempted with == The issue seems to be with the operands, as 1. when " '${SECTOR}' " -- double quote followed by single quote -- awk matches... (1 Reply)
Discussion started by: deadyetagain
1 Replies

2. Shell Programming and Scripting

String comparison

hi team, i want to compare the below string from logs, but its is not working. if ]; then echo "restart some process" fi (4 Replies)
Discussion started by: mfaizan40
4 Replies

3. Homework & Coursework Questions

passing letters from an array into a string for string comparison

attempting the hangman program. This was an optional assignment from the professor. I have completed the logical coding, debugging now. ##I have an array $wordString that initializes to a string of dashes ##reflecting the number of letters in $theWord ##every time the user enters a (valid)... (5 Replies)
Discussion started by: lotsofideas
5 Replies

4. Shell Programming and Scripting

to extract string from main string and string comparison

continuing from my previous post, whose link is given below as a reference https://www.unix.com/shell-programming-scripting/171076-shell-scripting.html#post302573569 consider there is create table commands in a file for eg: CREATE TABLE `Blahblahblah` ( `id` int(11) NOT NULL... (2 Replies)
Discussion started by: vivek d r
2 Replies

5. Shell Programming and Scripting

Help with string comparison

#!/bin/sh PRINTF=/usr/bin/printf MACHINE_NAME=`uname -n` TIME=`date +"%H"` $PRINTF "Welcome to $MACHINE_NAME. What is your name?\n" read NAME if ; then $PRINTF "Good morning $NAME, how are you?\n" elif ; then $PRINTF "Good afternoon $NAME, how are you?\n" else $PRINTF "Good... (2 Replies)
Discussion started by: ikeQ
2 Replies

6. UNIX and Linux Applications

Need Help on String Comparison

Hi , My requirement is to read from a file into a variable. I need to check if the variable is equal to string "no rows selected". The sh script snippet is as follows: file=/data/lpgtwo/home/nikhilp/TriggerNames.txt echo $file var=`cat $file` echo $var if then echo "No... (3 Replies)
Discussion started by: MNG
3 Replies

7. UNIX for Dummies Questions & Answers

string comparison

Hi Guys i need to write a script to check the file structure I have added the the file headers in the configuration file and execute the file at the start of the script. Now the function checkFileStructure() { echo "Inside the function" filetocheck=$1 fileheader=$2 if ] then... (1 Reply)
Discussion started by: Swapna173
1 Replies

8. Shell Programming and Scripting

string comparison

Hello experts, (tcsh shell) Quite new to shell scripting... I have got a file with a single word on each line. Want to be able to make a comparison such that i can read pairs of words that are ROT13 to each other. Also, i would like to print the pairs to another file. Any help... (5 Replies)
Discussion started by: Jatsui
5 Replies

9. Shell Programming and Scripting

string comparison

The script will read a bunch of names, and test if it contains "John", but as below apparently ~ does not work, so what is the easiest way to perform string comparison in bash shell script? thanks ... elif then echo "get John" .... (2 Replies)
Discussion started by: fedora
2 Replies

10. Programming

String Comparison

Hi all, I have a file like this ibhib=ere wefwfl=werfe sfdes=wef From this file, i need to get the lefthand side string with respect to the corresponding righthand side string. i.e, I need to get the string "ere" with respect to "ibhib". But i am stuck with how to compare a string... (1 Reply)
Discussion started by: abey
1 Replies
Login or Register to Ask a Question