check if a variable contains a string - Page 2

methyl · #1 (**permalink**) 01-12-2009

Code:

basename "/a/b/c/d/e"
e

basename "/a/b/c/d/e/"
e

KingVikram · #2 (**permalink**) 01-15-2009

to find the last string on a path, try using basename, something like
basename path.

So the condition will look like

if [ `basename path` -ne $y ]

--Aj

bakunin · #3 (**permalink**) 01-15-2009

Quote:

Originally Posted by melanie_pfefer

is there a better solution that gets the last string and removes the trailing slash if it exists?

thanks.

What is a "better" solution? Less clockcycles to run? Less characters to type? Less seconds needed to come up with?

All the mentioned solutions use an external tool (basename, grep, etc.), which means the script has to load a program an run that and only after its completion it can resume its work. This costs some amount of time. If you do it only rarely you will barely notice the difference, if you do it in the middle of a loop which is often executed you will notice a severe difference.

Having said this, here is a solution completely done in shell only - no external tools used:

Code:

# x="/a/b/c/d/e"        # uncomment this and comment the next line - no difference
x="/a/b/c/d/e/"
y="f"                   # comment this, uncomment the following line and run again
# y="e"                 

x="${%%x/}"      # remove trailing slash if there is one
if [ "${x##*/}" = "$y" ] ; then
     echo "x and y are equal"
else
     echo "x and y are different"
fi

I hope this helps.

bakunin

fpmurphy · #4 (**permalink**) 01-16-2009

Typo ....

Code:

x="${%%x/}"      # remove trailing slash if there is one

should be

Code:

x="${x%%/}"      # remove trailing slash if there is one

melanie_pfefer · #5 (**permalink**) 02-02-2009

hi

echo "$x" | egrep "AF|GN"
if [[ "$?" -eq 0 ]];
then
echo NO OK
fi

the problem in the above is that it echos $x.

Is there a better if statement that says:

if [ $x contains these characters: AF or GN ]
then
echo NOT OK
fi

thanks

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