shell脚本练习02--求字符串的长度

 1 #########################################################################
  2 # File Name: 9-2.sh
  3 # Author: zhang yunabo
  4 # mail: ma6174@163.com
  5 # Created Time: Tue 11 Sep 2018 04:36:44 PM EDT
  6 #########################################################################
  7 #!/bin/bash
  8 #default="default"
  9 #inputvar=${1:-default}
 10 #inputvar=expr length $1
 11 #if [ $inputvar = $default ]
 12 #then
 13 #   echo "what's you write is $inputvar"
 14 #else
 15 #   echo "what's you write is $inputvar,length:${#inputvar}"
 16 #fi
 17 
 18 # paragraph-space.sh
 19 minlin=4
 20 
 21 while read line
 22 do
 23     echo "$line"
 24 
 25     len=${#line}
 26     if [ "$len" -lt "$minlin" ]
 27     then
 28         echo 
 29     fi
 30 done
 31 exit 0