Differences between revisions 3 and 4

Batch File Variables

Contents

Declaration

Variables are declared with the set [[Batch/BuiltinCommands#Set|builtin.

set foo=bar

Variables are accessed by their name. A percent sign (%) must surround the name.

set bar=%foo%

If a variable's value includes a character that the shell will interpret specially, quote the variable.

set bar="%foo%"

If a variable is not set, no substitution occurs.

set MyVar=
echo %MyVar% # '%MyVar%'

Variable	Value
`%CD%`	current working directory, ending in a slash (`/`) unless in a drive root
`%TIME%`	system time in a localized format
`%DATE%`	system date in a localized format
`%RANDOM%`	a generated pseudorandom number between 0 and 32767
`%ERRORLEVEL%`	error level returned by the most recent command or script
`%CMDEXTVERSION%`	version of Command Processor Extensions used by `cmd.exe`
`%CMDCMDLINE%`	command used to start `cmd.exe`

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== Special Variables ==

||'''Variable'''   ||'''Value'''                                                              ||
||`%CD%`           ||current working directory, ending in a slash (`/`) unless in a drive root||
||`%TIME%`         ||system time in a localized format                                        ||
||`%DATE%`         ||system date in a localized format                                        ||
||`%RANDOM%`       ||a generated pseudorandom number between 0 and 32767                      ||
||`%ERRORLEVEL%`   ||error level returned by the most recent command or script                ||
||`%CMDEXTVERSION%`||version of Command Processor Extensions used by `cmd.exe`                ||
||`%CMDCMDLINE%`   ||command used to start `cmd.exe`                                          ||