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Sebbern 12-13-2009 09:37 AM
Bash script to check if string1 contains string2
 
Help! :confused:

I'm going to make a bash script that checks if string1 contains string2.

So far i've got:

Code:
#!/bin/bash

input=$(echo $@)
if [ input == .txt ]
then
echo "yes"
else
echo "no"
fi
But that dosen't work!

Please help :scratch:

colucix 12-13-2009 09:47 AM
Some notes about your script:

1) you don't really need the assignment
Code:
input=$(echo $@)
since you can use $@ directly in the expression inside the if/then construct.

2) you forgot to put a $ sign before the variable name inside the expression:
Code:
if [ $input == .txt ]
without that you just evaluate the equivalence between two strings, which is obviously always false.

3) if using bash version 3 you can try the operator for Regular Expression Match so that your script will look like
Code:
#!/bin/bash
if [[ $@ =~ [.]txt ]]
then
  echo yes
else
  echo no
fi

ghostdog74 12-13-2009 07:21 PM
you can use case/esac

Code:
string1="abcdef"
string2="abc"
case "$string1" in
    *$string2* )
        echo "found"
        ;;
    *) echo "not found"
esac

bsat 12-14-2009 12:05 AM
awk implementation of the same.
BEGIN {
string1="abcdef"
string2="abcd"
if(match(string1,string2))
{
print "found"
}
else
{
print "not found"
}
}

ghostdog74 12-14-2009 12:38 AM
you should put your code in code tags.
Or this as well:
Code:
BEGIN {
  string1="abcdef"
  string2="abcd"
  if( string1 ~ string2){
      print "found"
  }else{
      print "not found"
  }
}

bsat 12-15-2009 04:19 AM
oh, ok I will do that in future . thanks for the info ghostdog :-)


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