CODEWITHSUNDEEP
bashunix
Noobie
Noobie

Reputation: 35

Extract data from variable in Unix

If my variable has data as,

test="score=5,grade=d,pass=f,"

Anyway I can extract the data/rewrite the data from/into the variable as,

test="score,grade,pass"

I do not need the data between =, &, and , characters.

Upvotes: 0

Views: 189

Answers (2)

ghoti
ghoti

Reputation: 46886

In pure bash (no external tools like sed or awk or perl required), you can use "Parameter Expansion" to manipulate strings. You can read about this in Bash's man page.

#!/usr/bin/env bash

test="score=5,grade=d,pass=f,"

# Use the "extglob" shell option for "extended" notation on patterns.
shopt -s extglob

# First, remove the bits from equals to before each comma...
test="${test//=+([^,]),/,}"

# Next, remove the trailing comma.
test="${test%,}"

echo "$test"

And here's a demo.

Upvotes: 5

Avinash Raj
Avinash Raj

Reputation: 174844

You may use sed.

echo "score=5,grade=d,pass=f," | sed 's/=[^,]*\(,$\|\)//g'

or

echo "score=5,grade=d,pass=f," | sed 's/=[^,]*\|,$//g'

DEMO

Upvotes: 0

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