Commands commonly used by the shell

Alias gives the command a nickname

$ C= ' Clear '

CD changes the current path

$ cd/etc Change the current path to/etc $ CD back home directory $ CD. Go back to the previous level directory $ CD-back to the directory you just went to

CP Copy files or directories

The CP file file1 copies a file for File1 to the current directory CP Dir1 Dir2-r

chmod changing file permissions

chmod u+r File adds owner read-only permission chmod u-w file to file minus owner write-only permission chmod u=x file causes file owner to have execute permission on file only chmod 777 File enables file to have read writable executable permissions for all users

Chown changing the owner of a file

chown Foo file changes the file owner to foo chown:bar file to change the file owning group to bar chown Foo:bar file to change the file owner to the owning group Foo and bar

Clear Clear Screen

Cat file Displays the file contents to the screen

Find Files

Find ~/-name "*.c"//Find out all of the. c files found in the home folder find ~/-type F//Find all the common files in the home directory

grep looks up a string in a file

grep "abc" example.c grep "Apple"/opt/src/*.c-rwnh Find/opt/src-type F | Xargs grep "Apple"-wnh-r if there is a subdirectory, recursive lookup-W strictly matches the specified word-n prints line number-H print file name

Ifconfig Finding IP addresses

Ifconfig Find IP address ifconfig, ifconfig eth0 192.168.0.11 Modify IP address ifconfig eth0 down network ifconfig eth0 up start Network

Kill sends a specified signal to the specified process or process group

Kill-s SIGKILL 1234 kill-s SIGKILL-1234//Send the signal to the process group KILL-9 1234//Send a signal named 9 to process number 1234

LS lists the current file information

LS lists the names under the current directory ls-l the details of the files in the current directory ls-a lists the files in the current directory (including hidden files)

LN takes an alias or creates a shortcut to a file

ln file1 file2//Hard connect two aliases of the same name ln a.txt lna.tex-s//Soft Connect create a shortcut key for A.txt

More/less split Screen Display

More file less file Ps-ef | More Ps-ef | Less

Man Find help Manual

Man LS help manual for finding LS

MV Move or rename

MV file1 file2 rename file1 to file2 mv file dir/move file to dir/

mkdir Creating an empty directory

mkdir dir

PWD Print Current working path

PS Viewing system process details

Ps-ef

RM Delete a file or directory

RM File Delete file RM dir-r Delete directory Add-r permission not enough add sudo in front

Sort sorts

Sort file prints out the contents of file files in sorted order

Touch creates an empty file

Touch file

Tar compression and decompression

TAR-CJF a.tar.bz2 *//compress all files into. bz2 format TAR-XJF a.tar.bz2//bz2 format extract TAR-CZF a.tar.gz *//compress all files into. gz format TAR-XZF a.tar.gz//gz Format decompression

Which find the path to a command

which LS

WC calculates the number of lines, words, and characters of a file.

WC file WC file1 file2-w The number of words in the files-l file number of characters-C file the number of bytes of the-m file

There is a supplement that will continue to be perfected.

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Commands commonly used by the shell