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BASH – Tips and tricks

Published on November 5, 2014 Author gryzliLeave a comment

Bash Variable String Manipulation

A = "123456"

# This prints the chars from 3 to 5
# Chars are counting from [0]
echo ${A:3:5}
# prints "456"

echo ${A:1:4}
# prints "2345"

# Prints the number of chars
echo ${#A}
# prints "6"

A = "123456"

# This prints the chars from 3 to 5

# Chars are counting from [0]

echo ${A:3:5}

# prints "456"

echo ${A:1:4}

# prints "2345"

# Prints the number of chars

echo ${#A}

# prints "6"

Front Match These are the examples of a front matching Front is meant to be “left to right” matching

a = "blog.gryzli.info"

echo ${a#*.}
# prints "gryzli.info"

echo ${a##*.}
# prints "info"

a = "blog.gryzli.info"

echo ${a#*.}

# prints "gryzli.info"

echo ${a##*.}

# prints "info"

Rear Match These are the examples of a rear matching Front is meant to be “right to left” matching a = “blog.gryzli.info” echo ${a%.*} # prints “blog.gryzli” echo ${a%%.*} #… Continue reading BASH – Tips and tricks →