Ubuntu – How to rename the set of files with pattern

regexrename

I have files which has name as following:

P50_FR_8_q2_scrolls.csv

Here the value 50 and 8 needs renaming & The results should be something like:

P21_FR_3_q2_scrolls.csv

I tired few similar to rename 's/\d{3}(\d{*})\.csv$P21_$1.csv' *.csv
But no luck. (It seems I am really bad at Linux regex)

The value 50->21 and 8->3 is something that i know. But the starting value and ending value is not always in same digit size.

Best Answer

Try

rename -n 's/50(_.*)_8/21$1_3/' *.csv

The -n flag doesn't do any renaming. You can test patterns this way. Remove it for actually performing the renaming.

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You can either use capture groups:

$ rename -n 's/(\d)a/$1.1/' *
Area.v2a.2.h -> Area.v2.1.2.h
Base.v2a.c -> Base.v2.1.c
Slider.v4a.h -> Slider.v4.1.h

Or you can use a lookbehind:

$ rename -n 's/(?<=\d)a/.1/' *
Area.v2a.2.h -> Area.v2.1.2.h
Base.v2a.c -> Base.v2.1.c
Slider.v4a.h -> Slider.v4.1.h

Or, similar to a lookbehind, the 0-length assertion \K, which means "forget everything matched until this point":

$ rename -n 's/\d\Ka/.1/' *
Area.v2a.2.h -> Area.v2.1.2.h
Base.v2a.c -> Base.v2.1.c
Slider.v4a.h -> Slider.v4.1.h

Note that I used the shorter \d instead of [0-9]. The two are equivalent, but rename is a perl script, so understands the syntax of Perl Compatible Regular Expressions (PCRE).

Note that this will only change the first occurrence of a number followed by an a. This may or may not be what you need, depending on your file names.

The -n makes rename show what it would do without actually doing anything. once you've confirmed that it works as expected, remove it to actually change the file names.

Best Answer

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