gembin

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Get substring of a string under UNIX/Linux

there many ways to do so.


str="hello world"

1) cut
Where -cN-M tells the cut command to return columns N to M, inclusive. 
cut -cN-M

start=1
end=5
sub_str=`echo ${str} | cut -c${start}-${end}`
output: hello

2) bash 
Note: if you are not sure of having bash, consider using cut. 
${str:offset}
$
{str:offset:length}

sub_str=${str:0:5}
output: hello

3) expr

expr substr string position length 
sub_str=`expr substr $str 1 5`
output: hello

 

posted on 2012-04-01 15:38 gembin 阅读(743) 评论(0)  编辑  收藏 所属分类: Linux


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