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Sed insert a line before match, you can use the sed function: i, add a new line before the matched string. syntax: sed '/option/i...

sed add line after match, you use sed function: a , to add a new line after the matched string. syntax: sed '/option/a newLine'...

The lsof command can not only view the files and directories opened by the process, but also view the socket-related information such as the port...

Linux recover deleted files, we can use the debugfs command. It can be used to examine and change the state of an ext2, ext3,...

mkdir no such file or directory - This error is reported because you created a multi-level directory and the intermediate directory does not exist. We...

mkdir creates a directory if it does not exist, we can use the mkdir -p option. syntax: mkdir -p foo/bar/baz, will create directories foo, foo/bar,...

Awk concatenated strings, you can use awk OFS variables, or you can use strings directly. syntax: awk'BEING {s1="string1";s2="string2";OFS="delimiter";print s1,s2;}'...

Awk substr has built-in functions that can help us select substrings anywhere in the input string. awk substr syntax: substr(string, start, lenght)...

To find files by name, we can use the linux find command. For example: find directory -type f -name "filename"...

ls -a : display all files and subdirectories in the current directory, including hidden "." And ".." etc; ls -l : display...

In linux/unix ls -t option can be sorted by date from newest to oldest, or ls -rt option can be sorted by date from oldest...

Grep command supports multiple exclusion methods, including grep exclude directory, grep exclude file, grep exclude binary files, and grep exclude keywords....

In linux/unix, we can use the grep -i option to ignore case matching search keywords. grep ignore case syntax: grep -i "keyword" file...

Linux top sort by memory can help us find out which processes use more memory. It has two ways to sort memory: top -o option...

linux tr command common examples: replacing specific characters, removing specific characters, deleting duplicate characters, etc....