CODEWITHSUNDEEP
stringbash
Kyle Van Koevering
Kyle Van Koevering

Reputation: 169

How to removing leading section in bash

How can I remove parts of a string up to a certain character?

Ex.) If I have the string testFile.txt.1 and testFile.txt.12345 how can I remove the 1 and 12345?

EDIT: I meant to remove and throw away the first part of a string up to a certain character and keep the end of it.

Upvotes: 7

Views: 12356

Answers (5)

yabt
yabt

Reputation: 1

# remove string prefix up to the first digit
var='testFile.txt.12345'
var='test1File.txt.12345'
var='testFile.txt.1'
var='testFile.txt'

echo "${var#"${var%%[[:digit:]]*}"}"

Upvotes: 0

DVK
DVK

Reputation: 129559

The question is a bit unclear - the example provided may mean you want to remove all #s, or remove the part after the last ".", or remove the part after the first "1", or even remove all charcters after character 13. Please clarify.

If you mean that you want to remove first N characters in a string (e.g. "up to a character # 13"), do echo testFile.txt.1 | cut -c14-. To retain the chars 1-13, on the other hand, do echo testFile.txt.1 | cut -c1-13

If you mean that you want to remove the beginning characters until the first occurence of a specific character (in your example that seems to be "1"), do echo testFile.txt.1 | perl -e 's/^[^1]*//;'. To remove everything AFTER the first "1", do echo testFile.txt.1 | perl -e 's/1.*$//;'

If you want to remove all the #s, do echo testFile.txt.1 | perl -e 's/\d//g;' or without Perl, echo testFile.txt.1 | tr -d "[0-9]"

If you want to remove everything after the last ".", do echo testFile.txt.1 | perl -e 's/\.[^.]+/./;'

Upvotes: 0

ghostdog74
ghostdog74

Reputation: 343141

using just bash facilities

$ s=testFile.txt.1
$ echo ${s%.*}
testFile.txt

$ s=testFile.txt.12345
$ echo ${s%.*}
testFile.txt

to remove before leading zero

$ echo ${s#*.}
txt.12345

Other method, you can split your string up using IFS

$ s=testFile.txt.12345
$ IFS="."
$ set -- $s
$ echo $1
testFile
$ echo $2
txt
$ echo $3
12345

Upvotes: 11

John Kugelman
John Kugelman

Reputation: 362157

You could use sed to do a search and replace. The <<< operator will pass in a string on stdin.

$ sed 's/\.[0-9]*$//' <<< "testFile.txt.1"
testFile.txt
$ sed 's/\.[0-9]*$//' <<< "testFile.txt.12345"
testFile.txt

Upvotes: 1

Michael Mrozek
Michael Mrozek

Reputation: 175745

If you just want to remove a known suffix from a filename, you can use basename:

basename testFile.txt.1 .1
basename testFile.txt.12345 .12345

Upvotes: 1

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