CODEWITHSUNDEEP
bashshell
Mike
Mike

Reputation: 35

Substring from a output of a command

Execute the below command and got the output- command=

keytool -list -keystore /etc/pki/java/cacerts -storepass "changeit" | grep _abc_

output=

_abc_sec1, Mar 23, 2021, trustedCertEntry,
_abc_sec2, Aug 30, 2021, trustedCertEntry,

What is the easiest and short way to fetch _abc_sec1 and _abc_sec2 one by one and store in a variable

Upvotes: 0

Views: 303

Answers (1)

0stone0
0stone0

Reputation: 44275

Using cut to get the first column (separated by ,)

We can use the arr=( $(command) ) syntax to parse the output to a bash array.
How do I assign the output of a command into an array?

Then we can easily loop over each substring:

#!/bin/bash

arr=( $(keytool -list -keystore /etc/pki/java/cacerts -storepass "changeit" | grep _abc_ | cut -d',' -f1) )

for ss in "${arr[@]}"; do
   echo "--> $ss"
done

Local example, we're I've placed the 'input' in a text file to mimic the command:

$ cat input
_abc_sec1, Mar 23, 2021, trustedCertEntry,
_abc_sec2, Aug 30, 2021, trustedCertEntry,
something else
$
$
$ cat tst.sh
#!/bin/bash

arr=( $(cat input| grep _abc_ | cut -d',' -f1) )

for ss in "${arr[@]}"; do
   echo "--> $ss"
done
$
$
$ ./tst.sh
--> _abc_sec1
--> _abc_sec2
$

Upvotes: 1

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