Go版本selpg

简介

该程序使用golang开发开发Linux命令行实用程序中的selpg

开发环境

• CentOS7
• go 1.9.4 linux/amd64

使用

下载

go get github.com/cyulei/Golang_selpg

参数

selpg -s=Number -e=Number [options] [filename]

• -s : Start page.
• -e : End page.
• -l : Determine the number of lines per page and default is 20.
• -f : Determine the type and the way to be seprated.
• -d : Determine the destination of output.
• [filename] : Read input from this file.
• If filename is not given, read input from stdin. and Ctrl+D to cut out.

示例

selpg -s1 -e1 -l10 test.txt

将test.txt第1页的前10行打印到屏幕上

This is the line 1
This is the line 2
This is the line 3
This is the line 4
This is the line 5
This is the line 6
This is the line 7
This is the line 8
This is the line 9
This is the line 10

selpg -s1 -e1 < test.txt

selpg读取标准输入，而标准输入被shell/内核重定向为来自test.txt而不是显示命名的文件名参数。输入的第1页被写至屏幕。1页有20行。

This is the line 1
This is the line 2
This is the line 3
This is the line 4
This is the line 5
This is the line 6
This is the line 7
This is the line 8
This is the line 9
This is the line 10
This is the line 11
This is the line 12
This is the line 13
This is the line 14
This is the line 15
This is the line 16
This is the line 17
This is the line 18
This is the line 19
This is the line 20

selpg -s2 -e2 test.txt > out.txt

将第2页写入out.txt中

out.txt：
This is the line 21
This is the line 22
This is the line 23
This is the line 24
This is the line 25
This is the line 26
This is the line 27
This is the line 28
This is the line 29
This is the line 30

selpg -s1 -e0 test.txt 2>error.txt

将错误消息写入test.txt中

test.txt:
: invalid end page 0

selpg -s3 -e5 -l4 test.txt >out.txt 2>error.txt

将第3到5页写入out.txt中，标准错误将被写入error.txt中

out.txt:
This is the line 9
This is the line 10
This is the line 11
This is the line 12
This is the line 13
This is the line 14
This is the line 15
This is the line 16
This is the line 17
This is the line 18
This is the line 19
This is the line 20

selpg -s1 -e1 -f test.txt

假定页由换页符界定，第1页被打印到屏幕（因为测试文档中没有换页符，所以文档中所有内容打印出）

This is the line 1
This is the line 2
This is the line 3
This is the line 4
This is the line 5
This is the line 6
This is the line 7
This is the line 8
This is the line 9
This is the line 10
This is the line 11
This is the line 12
This is the line 13
This is the line 14
This is the line 15
This is the line 16
This is the line 17
This is the line 18
This is the line 19
This is the line 20
This is the line 21
This is the line 22
This is the line 23
This is the line 24
This is the line 25
This is the line 26
This is the line 27
This is the line 28
This is the line 29
This is the line 30

selpg -s1 -e1 -l5 -dcat test.txt

将第1页发送之命令cat，将前5行打印在屏幕上

This is the line 1
This is the line 2
This is the line 3
This is the line 4
This is the line 5