[Extract substring] extract substring with cut in bash #bash #linux

extract-substring.sh

# one line
## explaination
### 1. echo something and pipe to cut for processing
### 2. -d<char> means cut string by char
### 3. -f<num> means get the second set of cutted result
echo 'someletters_12345_moreleters.ext' | cut -d'_' -f 2

# multi line
INPUT='someletters_12345_moreleters.ext'
SUBSTRING=$(echo $INPUT| cut -d'_' -f 2)
echo $SUBSTRING