CHENTONG Reading time ~1 minute 

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#!/bin/bash
echo 'This is used to delete the space begin and end of the line'
 
if test $# -ne 1; then
        echo 1>&2 "Usage $0 file"
        exit 1
fi
 
set -x
 
sed -i 's/^ *//g' $1
sed -i 's/ *$//g' $1
 
sed -i 's/[ ][ ]*/ /g' $1

去除行首行尾多余的空格，把中间数量不等的空格替换为一个。主要用来处理uniq -c的输出文件。