Parsing the/etc/profile file in fedora14

Source: Internet
Author: User
Parsing the/etc/profile file in fedora14

Analyze the/etc/profile environment variable file in shell scripts

// A function in the pathmunge () shell program. path is the default path for Linux to search for commands. $1 generally represents the default path. For example, run source/etc/profile on the command line. $2 if it is after, it indicates that the path is changed to $ PATH $1

Pathmunge (){

Case $ {path} in




If [$2 = after]; then

Path = $ PATH $1


Path = $1 $ path




// Check whether/usr/bin/ID is executable before checking the variable EUID (valid user ID). If it is null, initialize the variables EUID and uid

If [-x/usr/bin/ID]; then

If [-z "$ EUID"]; then

# KSh workaround

EUID = 'id-U'

Uid = 'id-Ru'


User = "'id-UN '"

LOGNAME = $ user

Mail = "/var/spool/mail/$ user"


// Judge, if it is a root user, add/sbin,/usr/sbin/usr/local/sbin,/opt/friendlyarm/toolschain/4.4.3/bin to the PATH variable.

If ["$ EUID" = "0"]; then






Pathmunge/usr/local/sbin after

Pathmunge/usr/sbin after

Pathmunge/sbin after


Hostname = '/bin/hostname 2>/dev/null'


// Indicates the maximum number of command PWD commands that can be run three times in a row when the history command is input. After history is executed, you will see three duplicate entries. To remove these duplicate entries, you can set histcontrol to ignoredups: Use histcontrol to force history not to remember specific commands and set histcontrol to ignorespace, enter a space before the command that you do not want to remember.

History Size = 1000

If ["$ histcontrol" = "ignorespace"]; then

Export histcontrol = ignoreboth


Export histcontrol = ignoredups


// Set the variables initialized above as Environment Variables

Export path user LOGNAME mail hostname histsize histcontrol

// PS1 is the basic prompt. For example, if the root user is #, the common user is $

// PS2 is an auxiliary prompt, such as>

// Finally Delete the variables and functions used in this script

// Execute all script files in the/etc/profile. d/directory.

For I in/etc/profile. d/*. Sh; do

If [-R "$ I"]; then

If ["$ PS1"]; then

. $ I


. $ I>/dev/null 2> & 1




// Finally Delete the variables and functions used in this script
Unset I

Unset pathmunge


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