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substring in shell script

STR="birthday-091216-pics"
SUBSTR=$(echo $STR | cut -d'-' -f 2)
echo $SUBSTR
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how to print substring in bash script

INPUT='someletters_12345_moreleters.ext'
SUBSTRING=$(echo $INPUT| cut -d'_' -f 2)
echo $SUBSTRING
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substring in string shell

# You can do it in two ways
# 1) Let "grep" read on its standard input

echo "$line" | grep -o select

# 2) tell "grep" here is the string

grep select <<< "$line"
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