Bash Array

Assign Array Elements

 
# Assign array elements
echo
myArr[0]='one'
myArr[1]='two'
myArr[10]='ten'
# Access array elements. *Curly brackets* are important.
echo "\${myArr[0]}: ${myArr[0]}"  # ${myArr[0]}: one.
# Echo all elements
echo "\${myArr[@]}: ${myArr[@]}" # ${myArr[@]}: one two ten
 
# Initialize array
echo
myArr3=( one two three four )
# Echo all elements
echo "\$myArr3[@]: ${myArr3[@]}" # $myArr3[@]: one two three four
# Number of array elements
echo "\$#myArr3[@]: ${#myArr3[@]}" # $#myArr3[@]: 4
 
# Initialize array
echo
myStr2='one two three four'
myArr2=( $myStr2 )
# Echo all elements
echo "\${myArr2[@]}: ${myArr2[@]}" # ${myArr2[@]}: one two three four
 

Tokenize String Into Array

 
myString2=one:two::four
oldIFS=$IFS
IFS=:
myArr2=( $myString2 )
IFS=$oldIFS
echo ${myArr2[0]}  # Output: 'one'
echo ${myArr2[1]}  # Output: 'two'
echo ${myArr2[2]}  # Output: ''
echo ${myArr2[3]}  # Output: 'four'
 

Loop Through Array Elements

 
myStrings='string1 string2 string3'
myStringArray=( ${myStrings} )
for myString in "${myStringArray[@]}"
do
  echo "${myString}"
done
 

References

http://tldp.org/LDP/abs/html/arrays.html

Monday, January 11th, 2010, by Jianming Li and is filed under "bash ". Both comments and pings are currently closed.

Comments are closed

« Apache 2 mod_rewrite || Bash Samples »