awk随笔

1.输出指定长度的字符串，位数不够时以空格补充，默认右对齐：

[tortoise@sea temp]$ awk '{printf "%50s\t%s\n",$1,$2}' test.txt
                                fdsafdsafdsfdsfdsf      fdsafdsafdsafdsre1r32r
                                            fdsafd      u0t435435345
                                 5382-4932jfermnwf      rfewqre3rqewqr
                                              fdsa      fewqr3241r4324
[tortoise@sea temp]$ 

加上-表示左对齐：

[tortoise@sea temp]$ awk '{printf "%-50s\t%s\n",$1,$2}' test.txt
fdsafdsafdsfdsfdsf                                      fdsafdsafdsafdsre1r32r
fdsafd                                                  u0t435435345
5382-4932jfermnwf                                       rfewqre3rqewqr
fdsa                                                    fewqr3241r4324
[tortoise@sea temp]$

 

2.toupper：将字符串中的小写字符转换为大写字符：

[tortoise@sea temp]$ echo "Tortoise" | awk '{print toupper($1)}'
TORTOISE
[tortoise@sea temp]$ echo "torToise" | awk '{printf "%s\n",toupper($1)}'
TORTOISE
[tortoise@sea temp]$ 

 

3.tolower：将字符串中的大写字符转换为小写字符：

[tortoise@sea temp]$ echo "Tortoise" | awk '{print tolower($1)}'
tortoise
[tortoise@sea temp]$ echo "TOrToise" | awk '{printf "%s\n",tolower($1)}'
tortoise
[tortoise@sea temp]$