Linux set Command

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Linux set Command

Linux Command Complete Reference

The Linux set command is used to configure the shell.

The set instruction can configure the execution behavior of the shell being used, allowing settings to be made according to different requirements.

Syntax

set [+-abCdefhHklmnpPtuvx]

Parameter Description:

• -a Mark modified variables for export to environment variables.
• -b Make terminated background jobs immediately report their execution status.
• -C Prevent output redirection from overwriting existing files.
• -d The shell uses a hash table by default to remember used commands to speed up command execution. Use the -d parameter to disable this.
• -e Exit the shell immediately if a command returns a non-zero value.
• -f Disable the use of wildcard characters (globbing).
• -h Automatically record the location of functions.
• -H The shell can use "!" plus <command number> to execute commands recorded in history.
• -k All parameters given to a command are treated as environment variables for that command.
• -l Record the variable names used in for loops.
• -m Use monitor mode.
• -n Read commands but do not actually execute them.
• -p Enable priority mode.
• -P After enabling the -P parameter, when executing commands, actual files or directories are used instead of symbolic links.
• -t Exit the shell after executing the following command.
• -u Display an error message when an undefined variable is used during execution.
• -v Display the input values as they are read by the shell.
• -x Display the command and its parameters before executing each command.
• +<parameter> Cancel a parameter that was previously enabled by set.

Examples

Display environment variables

# set
BASH=/bin/bash
BASH_ARGC=()
BASH_ARGV=()
BASH_LINENO=()
BASH_SOURCE=()
BASH_VERSINFO=(="3" ="00" ="15" ="1" ="release" ="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
HISTSIZE=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=(="2")
PPID=26005
PROMPT_COMMAND='echo -ne "

Linux Command Complete Reference