Linux set command details how to use Linux set command

The set command can be used to set the shell execution method, which can be set according to different requirements.

Syntax

Set [+-abCdefhHklmnpPtuvx]

Parameter description:

• -A indicates the modified variables for output to the environment variables.
• -B: immediately returns the execution status of the terminated background program.
• -C: The generated file cannot overwrite the existing file.
• -D Shell uses the command used by the table to accelerate the execution of the command. The-d parameter can be canceled.
• -E. If the return value of the command is not equal to 0, exit the shell immediately.
• -F cancels the use of wildcards.
• -H automatically records the location of the function.
• -H Shell can use "! "Add <command number> to execute commands recorded in history.
• The parameters given by the-k command are considered as the environment variables of the command.
• -L record the variable name of the for loop.
• -M uses the monitoring mode.
• -N: only read commands, not actually executed.
• -P starts the priority mode.
• After the-P parameter is started, the symbolic connection is replaced by the actual file or directory when the command is executed.
• -T run the subsequent command to exit the shell.
• -U: an error message is displayed when undefined variables are used during execution.
• -V displays the input values read by shell.
• -X: after the command is executed, the command and its parameters are displayed first.
• + <Parameter> cancel a parameter that was started by a set.

Instance

Show environment variables

# Set

BASH =/bin/bash

BASH_ARGC = ()

BASH_ARGV = ()

BASH_LINENO = ()

BASH_SOURCE = ()

BASH_VERSINFO = ([0] = "3" [1] = "00" [2] = "15" [3] = "1" [4] = "release" [5] = "i386-redhat-linux-gnu ")

BASH_VERSION = '3. 00.15 (1)-release'

COLORS =/etc/DIR_COLORS.xterm

COLUMNS = 99

DIRSTACK = ()

EUID = 0

GROUPS = ()

G_BROKEN_FILENAMES = 1

HISTFILE =/root/. bash_history

HISTFILESIZE = 1000

History size = 1000

HOME =/root

HOSTNAME = hnlinux

HOSTTYPE = i386

IFS = $''

INPUTRC =/etc/inputrc

KDEDIR =/usr

LANG = zh_CN.GB2312

LESSOPEN = '|/usr/bin/lesspipe. sh % s'

LINES = 34

L

MAIL =/var/spool/mail/root

MAILCHECK = 60

OLDPWD =/home/uptech

OPTERR = 1

OPTIND = 1

OSTYPE = linux-gnu

PATH =/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin: /usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin: /opt/crosstools/gcc-3.4.6-glibc-2.3.6/bin PIPESTATUS = ([0] = "2 ")

PPID = 26005

PROMPT_COMMAND = 'echo-ne"