This article describes the uniq command and how you can use the this command to remove duplicate lines from a text file in Linux.
/bin/bash err_usage(){ echo "The Arguments are not accepted!" echo "Usage: $0 <-i or -e> <FILENAME> <FROM_LINE_NUMBER>" echo "-i : Remove lines including the given line." echo "-e : Remove lines excluding the given line." exit 1 } if [ $# -ne 3 ]; then err_usage ...
6. Remove Trailing Blank Lines Only Usually, text processing tools process a file’s lines in order from the beginning to the end of the file, and it’s not easy to look back at a line we’ve already processed. Therefore, our main challenge to this problem is to find out the last ...
Remove columns from the lines of a file. column A utility that formats its input into columns. comm Used to compare two sorted files line by line. command Used to execute a command with arguments ignoring shell function named command. compress Used to compress one or more file(s) and repla...
(filename, lineno): fro = open(filename, "r",encoding='UTF-8') current_line..., "r+") frw.seek(seekpoint, 0) # read the line we want to discard fro.readline() # 读入一行进内存...,同时 文件指针下移实现删除 # now move the rest of the lines in the file # one line back ...
cat -b textfile1 textfile2 >> textfile3 Shell 清空/etc/test.txt 文档内容: cat /dev/null > /etc/test.txt Shell cat 也可以用来制作镜像文件。例如要制作软盘的镜像文件,将软盘放好后输入: cat /dev/fd0 > OUTFILE Shell 相反的,如果想把 image file 写到软盘,输入: ...
Blank lines are not always desirable, and you might feel the need to leave them out and only remain with the lines that contain text. Linux offers a couple of text manipulation expressions that you can use to omit or remove blank lines. How to remove bla
22.cut (cut 剪切;remove sectons from each line of files 从文件每一行中删除节段) 【命令作用】显示文件中指定的内容 【命令语法】cut [选项](参数) 【常用选项】 -b 仅显示指定范围的内容 【参数说明】需要过滤的文件 【命令示例】 只查看文件/etc/passwd每行的前3列内容 ...
Method 1: Run the sed Command to Remove Empty Lines in Bash In our first solution, we will use the sed command to remove the empty lines in Bash from the file. The sed command is used to do simple text changes. The stream editor sed can remove blank lines from files, as seen below...
remove 删除指定的rpm软件包 resolvedep 显示rpm软件包的依赖关系 search 检查软件包的信息 shell 进入yum的shell提示符 用法举例: yum install package 安装软件包 yum update package 更新软件包;如果不指定软件包名,则更新系统内所有软件 yum remove package 删除软件包 yum search package 搜索软件包 yum list all...