Increment (1st) number of each line found in file with one

Question

I need to increment the numbers form a file using awk/sed/... .

file:

step0=action_a
step1=action_b
step2=action_c

output:

step1=action_a
step2=action_b
step3=action_c

I've tried with:

awk '/step/{ $2=$2+1 }' file

but the step numbers are not incremented.

this is very broad. May be best to show your attempts, since this will also narrow down your problem. See [tour] for the basics, welcome! — fedorqui, Sep 02 '15 at 16:05
using: ` awk '/step/{ print $1 }'` returns: step0=action_a step1=action_b step2=action_c — Razvan, Sep 02 '15 at 16:51
That was a *hint* given by @KarolyHorvath as to why $2 does not refer to what you think it does. — Happy Green Kid Naps, Sep 02 '15 at 16:54
possible duplicate of [Perl / Awk / Sed - Find and Replace Number & auto-increment](http://stackoverflow.com/questions/23689603/perl-awk-sed-find-and-replace-number-auto-increment) — tripleee, Sep 03 '15 at 12:08

score 2 · Accepted Answer · edited May 23 '17 at 11:52

2

Using Ed Morton's answer on a similar question, you could do it like this:

$ awk -F'[^[:digit:]]+' '{sub(/[[:digit:]]+/,$2+1)}1' file
step1=action_a
step2=action_b
step3=action_c

This replaces the first number (i.e. sequence of digits) with the matched number plus one.

edited May 23 '17 at 11:52

Community

answered Sep 02 '15 at 16:53

user000001

Thank you! Solved my problem! – Razvan Sep 02 '15 at 17:03
@EdMorton is it limited to GNU awk, failed on my AIX and fine on my RHEL – NeronLeVelu Sep 03 '15 at 06:38
@NeronLeVelu I tested with `gawk --posix` and it appears to work, without printing any warning about non-posix syntax. Not sure why it doesn't work on AIX. – user000001 Sep 03 '15 at 08:52
here, the `=action_` is removed but number is correctly incremented – NeronLeVelu Sep 03 '15 at 13:52

score 1 · Answer 2 · answered Sep 02 '15 at 16:54

1

awk can do it for sure. however, with vim, your problem could be solved very easily.

vim -c "%norm! ^A" file

the ^A you press Ctrl-V Ctrl-A

then check the changed text in your vim, if you are satisfied, then press :wq save the file and quit.

If this is not the answer you are looking for, let me know, I would remove the answer.

answered Sep 02 '15 at 16:54

Kent

Thank you for the answer, but it doesn't solve my issue. – Razvan Sep 02 '15 at 17:04

2 Answers2