bash脚本交换文件的两列

#!/bin/bash
if test $# -ne 2; then
        echo 1&>&2 "Usage rename.sh inputfile outputfile"
        exit 1
fi
 
IN=$1
OUT=$2
set -x
awk 'BEGIN {FS=" ";OFS=" "}
	{ss=$1; $1=$2; $2=ss;
	print $0;
	}' $IN >$OUT

This script can be used to swap the first and second column seperated by FS which is space here, and you can specify the OFS which is the new delimeter of the swapped file.

In print, you can also use ‘%s’ to output in your wanted format.

such like

awk '{printf "%6s %10s" $2, $1}' file

much like this.