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带颜色打印
#!/bin/bash
# 红色
printf "\033[31mThis is red text\033[0m\n"
# 绿色
printf "\033[32mThis is green text\033[0m\n"
# 黄色
printf "\033[33mThis is yellow text\033[0m\n"
# 蓝色
printf "\033[34mThis is blue text\033[0m\n"
忘记干啥的了
awk '{for(i=0;++i<=NF;)a[i]=a[i]?a[i] FS $i:$i}END{for(i=0;i++<NF;)print a[i]}'
++i操作
a=1
a=$(($a+1))
a=$[$a+1]
a=`expr $a + 1`
let a++
let a+=1