How to redirect grep output to a variable?

Question

I have some pipe. For example, I have this pipe:

user@user:~$ cal | head -1 | grep -oP "[A-Za-z]+"

For this pipe I get this result:

September

I want to store this result to a variable. I write the following commands:

user@user:~$ cal | head -1 | month=$(grep -oP "[A-Za-z]+") | echo $month

And I get the blank string. What is the problem?

With `bash` >= 4.2: `printf -v month "%(%B)T"` – Cyrus Dec 15 '21 at 23:09 — Cyrus, Dec 15 '21 at 23:09

score 15 · Accepted Answer · answered Sep 07 '14 at 13:24

15

 month=$(cal | head -1 | grep -oP "[A-Za-z]+")

or

 month=$(date +%B)

answered Sep 07 '14 at 13:24

Cyrus

thank you. This is work. But why I have a problem? I can not to redirect grep output to a variable? – Denis Sep 07 '14 at 13:31
This is not possible: `command1 | variable="$(commsn2)"`. Write `variable="$(command1 | command2)"`. – Cyrus Sep 07 '14 at 13:47
The second suggestion is a much better idea @Denis. – Tom Fenech Sep 07 '14 at 13:53

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