Linux Small Command

View

Cat filename "View inside content, Cate, cat, look like a cat."

More file name "View the file, too many files, one can not see the end, with more to view the next page: space or F next line: Enter Exit : Q or C6>q"

Clear Screen

Clear Command shortcut key ctrl+l

is cls in Windows

Clear a row

CTRL +u command wrong, not a single character deleted

CTRL + C terminate command

CTRL + a cursor to the beginning

Ctrl+e cursor to end of line

Ctrl+k the content after clipping the cursor

Ctrl+y paste Cut content

Command history

History lists all the commands

! ordinal execution History of the first few commands

Press Up ( or downward ) Arrows to turn out history

Input and output redirection

The Shell pre-defines 3 file descriptors for each process

0 Standard input STDIN keyboard

1 standard output STDOUT display

2 standard error output STDERR

Redirect is to change this standard device, input not from the keyboard, output does not display on the monitor

Output redirection

> or >> (echo abc>a echo b>>a append )

Example: echo Hello shows directly to the monitor

Echo Hello>test.txt

Ls-l/tmp>files.txt

More files.txt View file contents

List of files larger than 100M under/WebSite

Find/website-size +204800 >/backup/100m+.file.list

If you do not want to replace the previous content, it is appended, with >>

Output redirection with a lot of, a person to manage dozens of servers, scheduled to save the system state to the file, and then send mail by the administrator

Input REDIRECT ( does not enter content from the keyboard )

Example:Wall </test/msg broadcast from a file read content

In this way, you can use a scheduled task, a year of holiday blessing words written, and then automatically

Date View system time

Date-s "2014-4-11 10:52:23" modified time

Clock View hardware time

Time Synchronization settings:

Clock--SYSTOHC assigns system time to = hardware time (Hardware time and system time)

Clock--hctosys Assign hardware time to = = System time (make system time and hardware time same)

Set system language to English, solve garbled problem

lang= not write anything behind, indicating that using the system defaults, the system is English by default

Input REDIRECT ( does not enter content from the keyboard )

Example:Wall </test/msg broadcast from a file read content

In this way, you can use a scheduled task, a year of holiday blessing words written, and then automatically

Error output redirection

2> or 2>>

Example: Automatic backup usually scheduled tasks are performed automatically in the wee hours of the morning

Cp-r/usr/backup/use 2>>/bak.error

Directing error messages to a file

LS/AAAAAA 2>ls.err if /aaaaa This directory does not exist, save the error message to ls.err

2 in this , that's thefront Shell . Pre-defined 3 file descriptors for each process

Both 0 and 1 can be omitted,and2 cannot be omitted.

Linux Small Command