Linux shell command

Cat/proc/meminfo
Cat/proc/cpuinfo
Ipcs-a
Ipcs-m
Ipcs-s
Ipcs-q

Mkdir-p name when the parent directory does not exist is to create it

INFOCMP VT100

Echo $TERM

Xterm

Konsole

Getconf Long_bit

Arch

Release= ($ (</etc/redhat-release))


Lsb_release

CD-

RZ sz

echo $PS 1

Ls-f (after the directory Plus/)-R (List all directories)-l-i (node)-sail (combination)
Ls-l file filter, file can match my* my?

Touch file

Cp-p (Preserve access, modify time copy)-R (Recursive)-f (mandatory, overwrite already available)
Cp-l file1 file2 Create a hard link to file1 file2
Cp-s file1 file2 Create a soft link to file1 file2 (only in the current directory)

Stat file

File 1.txt

Cat-n (line number)-B (Text line line number)-T (does not allow tab appearance)

More (d,q,s,f,b,n,v,=)
Less tail head

Ps-ef viewing a process running on a system
Ps-l
Ps-efh

Kill num
Kill-s Signal
Killall *

MOUNT-T Type device directory (Ro,rw,usr,check=none,loop)

Df-h Show Disk space
Du-c-s-h Display directory space

Sort file (sorts data within text)-N (distinguishes between numbers and strings)-m (identifies three-letter month)-T (delimiter)

grep t-v-n-c-E

Bzip2
Bzcat
Bunzip2
Bzip2recover

Gzip
Gzcat
Gunzip

Zip
Zipcloak
Zipnote
Zipsplit
Unzip

Tar..


PRINTENV Viewing global variables
Set shows all environment variables (local, and global) set by a particular process

Create a global variable: Export the local variable

Login Shell Read File order:
1,/etc/profile--->/ETC/PROFILE.D
2, $HOME/.bash_profile----> $HOME/.bashrca
3, $HOME/.bash_login
4. $HOME/.profile

Alias

useradd-d View
USERADD-M Create home Directory-S (change default shell)-R (delete)


Usermod
passwd
chpasswd
Chage
Chfn
Chsh

Finger user

Groupadd-n


Fdisk
Mkefs
Mke2fs
Mkfs.ext3
Mkfs.ext4
Mkreiserfs
Jfs_mkfs
Mkfs.xfs

FSCK Check and Repair file system

Pvcreate
Vgcreate
Vgdisplay
Lvcreate
Lvdisplay

Aptitude (Debian)


Emacs File

Date
W.H.O.
Expr
Bc
Test statement



In the shell

String <,> to escape
-N (not 0)-Z (whether 0)
Value:-eq-ge-gt-le-lt-ne
string = = = < >-n-z

File comparison
-D file exists and directory?
Is the-e file present?
-f file exists and file?
-R file exists and is readable?
-s file exists and is not empty?
-W file exists and is writable?
-X file exists and is executable?
-o file exists and belongs to the current user?
-G file exists with default value same as current user

File1-nt file2 file1 New to File2
File2-ot file2 old?

BaseName

$? Last Run result
$ #命令行参数个数
The $* variable saves all arguments supplied on the command as a single word
[Email protected] treats the arguments appearing on the command line as multiple separate words in a string


Getopt
Getopts

Echo-n Remove end line break
Read-p message
Read-t time
READ-NL Accept single word specifier exit

&> redirect multiple streams to a single stream

>&n Redirect to a numeric descriptor, add &

Echo Temporary redirect
EXEC Permanent redirect

Redirect to $-to indicate close descriptor

LSOF lists the system open file descriptor-A is for the following results and
$$ Special environment variable (the shell will set it as the current PID)

MKTEMP-T (Force created at/TMP)-D (temp directory)

Tee is equivalent to two pipes sent to both sides
Sleep 100

Ctrl + Z Hang signal
Ctrl + C terminating signal
Kill-9 PID

Trap command signals intercept signal

Elf_file & background run, but terminal quits, it ends
Nohup running in the background, even if the terminal exits

Jobs Control $$ Current PID
Restart stop job BG Job ID
Foreground run job FG Job ID

Nice-n 10 re-establishing process priorities

Renice re-enactment of already running priorities

At commits to the job queue ATD is the at daemon
at [-F filename] Time

ATQ Viewing wait jobs
ATRM Deleting jobs


Cron Schedule Table
Crontab-l List Schedules
/etc/cron.*ly


Anacron will not miss the plan, the above may be shutdown missed plan, this can be powered on the first time to run
/var/spool/anacron

Run script on Boot
/etc/init.d/rc.loacl
/etc/rc.local
/etc/rc.d/rc.local

Source executes the command in the current environment, rather than creating a new shell

Select to create a menu from a single command line