如何先移动文件的最后一行? [英] How I can move last line of a file first?

问题描述

我有一个文件，按顺序包含 3 行:

bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_off.vtran"bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_on.vtran"bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_sanity_dft.vtran"

我必须按照这个顺序一一执行unix命令行中的所有行:

bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_sanity_dft.vtran"bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_off.vtran"bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_on.vtran"

我如何重新排列 &使用单个命令行执行所有 3 个命令?

我已经按照你的建议尝试了:

line1: echo startline2: bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_sanity_dft.vtran"第 3 行:回声你好line4: bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_off.vtran"第5行:回声再见line6: bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_on.vtran"第 7 行:回声结束

它仍然只执行 line1 &线2.之后退出那里..

解决方案

你可以使用tac(连接并反向打印文件)，在最后打印第一项然后反向返回:

tac 文件 |awk 'NR==1 {行=$0;下一个} 1;END{打印行}' |战术

更新

<块引用>

非常感谢 fedorqui 对我第一部分问题的回答.一世可以将命令的输出重定向到文件 &从命令行一一执行.相反，你能向前迈出一步吗?建议一种在单个命令中执行此操作的方法(无需重定向到档案及来源)

您可以通过管道传输到 bash:

tac 文件 |awk 'NR==1 {行 =$0;下一个} 1;END{打印行}' |tac |猛击

示例

$ cat 文件123$ tac 文件 |awk 'NR==1 {行 =$0;下一个} 1;END{打印行}' |战术312

分块:

• 反向

  $ tac 文件321

• 在最后打印第一项:

  $ tac 文件 |awk 'NR==1 {行=$0;下一个} 1;END{打印行}'213

• 反向:

  $ tac 文件 |awk 'NR==1 {行 =$0;下一个} 1;END{打印行}' |战术312

I have a file which contains 3 lines in this order:

bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_off.vtran"
bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_on.vtran"
bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_sanity_dft.vtran"

I have to execute all lines in unix command line one by one in this order:

bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_sanity_dft.vtran"
bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_off.vtran"
bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_on.vtran"

How can I rearrange & execute all 3 commands using a single command line?

I have tried as you suggest:

line1: echo start 
line2: bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_sanity_dft.vtran"
line3: echo hello 
line4: bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_off.vtran" 
line5: echo bye 
line6: bsub -I -q vtran "vtran -scan_pad 0X ../test/pm30_60_224_jtag_bist_full_vector_on.vtran" 
line7: echo end 

It still execute only line1 & line2. Exit there after..

解决方案

You can make use of tac (concatenate and print files in reverse), print the first item at the end and then reverse back:

tac file | awk 'NR==1 {line=$0; next} 1; END{print line}' | tac

Update

Thank you so much fedorqui answering for my first part of question. I can redirect the output of your command to a file & source it from the command line to execute one by one. instead Can you step forward and suggest a way to do it in a single command (without redirecting to a file & source)

You can pipe to bash:

tac file | awk 'NR==1 {line =$0; next} 1; END{print line}' | tac | bash

Example

$ cat file
1
2
3

$ tac file | awk 'NR==1 {line =$0; next} 1; END{print line}' | tac
3
1
2

By pieces:

• reverse

  $ tac file
  3
  2
  1
  

• print first item at the end:

  $ tac file | awk 'NR==1 {line=$0; next} 1; END{print line}'
  2
  1
  3
  

• reverse:

  $ tac file | awk 'NR==1 {line =$0; next} 1; END{print line}' | tac
  3
  1
  2
  

这篇关于如何先移动文件的最后一行?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！