Remove an initial part of a string in tcsh

Question

I have a variable storing "ping_abc", how do I remove the "ping_" part to get just "abc"?

My approach: variable 'test' stores "ping_abc"

I tried:

echo ${test:0:4}

But this is giving me:

Bad : modifier in $ (4), error

Approach on suggested answer by @Yaron:

set test = "ping_abc"
echo test | awk -F_ '{print $2}'
echo ping_abc | awk -F_ '{print $2}'

o/p:

        //blankspace
 abc

Why does the test variable not get truncated?

score 2 · Accepted Answer · answered Mar 06 '17 at 13:39

2

In tcsh, you can use "history style" : modifiers in parameter expansions:

xenial-vm:~> set test = ping_abc
xenial-vm:~> echo $test
ping_abc
xenial-vm:~> echo ${test:s/ping_//}
abc
xenial-vm:~>

answered Mar 06 '17 at 13:39

steeldriver

Yaron · Answer 2 · 2017-03-06T13:33:09.437

0

You can use awk in the following way:

echo ping_abc | awk -F_ '{print $2}'

which result with:

abc

Explanation about awk parameters:

More info man awk

edited Mar 06 '17 at 13:33

answered Mar 06 '17 at 13:24

Yaron

Showing me syntax error. – Ambareesh S J Mar 06 '17 at 13:27
awk: cmd. line:1: printf $2 awk: cmd. line:1: ^ syntax error with ^ pointing to p(rint) – Ambareesh S J Mar 06 '17 at 13:28
@AmbareeshSJ I've edit my answer to support both bash and tcsh. for tcsh you should use the following: echo ping_abc | awk -F_ '{print $2}' – Yaron Mar 06 '17 at 13:33

2 Answers2