Linux Shell Scripting Tutorial
Introduction Tools required for shell scripting First shell script Interacting with user Operators Special characters in BASH scripting Variables in Linux BASH scripting Arrays Integer operations floating point operations String manipulation in shell scripting Parameter substitution Command Substitution Conditional statements Looping statements Passing parameters exit status of the script Functions Sourcing filesString manipulation in linux shell scripting
This topic covers various ways in which we can manipulate strings in BASH scripting. Finding the length of the variable’s value All of below commands will print the length of the value of variable “city”
city=Brisbane
echo ${#city}
echo `expr length $city`
echo `expr “$city” : ‘.*’`
Finding the sub string position Below commands print the length of matching substring
echo `expr match “$city” ‘Bris’`
echo `expr “$city” : ‘Bris*’`
Finding the index of first character
echo `expr index “$city” b233`
echo `expr index “$city” 5n`
Extract the portion of the string
echo ${city:0}
echo ${city:1}
echo ${city:2:4}
echo ${city:(-4)}
echo ${city: -4}
You can also use expr to return the sub string.
echo `expr substr $city 1 3`
echo `expr substr $city 2 4`
Extracting arguments of the script
echo ${*:2}
echo ${@:2}
echo ${*:1:2}
Getting matched pattern
echo `expr match “$city” ‘(.*sb)’`
echo `expr “$city” : ‘(.*sb)’`
Delete the shortest and longest match from the beginning of the string
echo ${stringZ#a*C}
echo ${stringZ##a*C}
Delete the shortest and longest match from the end of the string
${city%b}
${city%%s}
Replace the sub string
${string/substring/replacement}
${string//substring/replacement}
echo ${city/bane/boon}
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