Filter a variable without awk/sed?

[qeldroma]

I want to filter a variable for slashes:

var=asdf/tzui

echo ${var#/}

Does not work, it filters only lines. So i have to find a way to filter the contents of a variable for / or and to change it in something else, p.e. a -

var=asdf/tzui

result=.........var../..-.....

echo $result

should lead into "asdf-tzui"...

[Qchem]

seeing as though you don't want to use sed i've come up with a dirty hack

 

var=asdf/tzui

part1=`echo $var | cut -d/ -f 1`

part2=`echo $var | cut -d/ -f 2`

result=`echo $part1-$part2`

echo $result

 

which gives asdf-tzui is this what you want??

[qeldroma]

Yes it does, too ;-)

 

Found another now:

 

echo ${var///}

[Qchem]

Hmm, I believe your way is slightly less dirty!!! :wink:

[ramfree17]

hey qeldroma, would you mind explaining the hash marks and slashes inside the reference notation? what does it actually do? i know its in the man page or tldp but i only have windows so please spoil me. ;)

 

ciao!

[qeldroma]

It's a possibility only available in BASH and Kornshell.

 

If you've got a variable like $var, you can echo the filtered variable:

 

echo ${var/...}

 

Where ... is the content to be removed. There are lot's of additional possibilities, like remove all until end/begin of string depending on a sequence.

Ex.:

var = "Hallo du Freak!"

var=`echo ${var/ Freak}`

echo $var

 

Leads to: "Hallo du!"

 

One disadvantage is that this way is by far NOT so complex like sed or awk. Only simple things can be done like this...