subst(n) Tcl (7.4) subst(n)
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NAME
subst - Perform backslash, command, and variable
substitutions
SYNOPSIS
subst ?-nobackslashes? ?-nocommands? ?-novariables? string
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DESCRIPTION
This command performs variable substitutions, command
substitutions, and backslash substitutions on its string
argument and returns the fully-substituted result. The
substitutions are performed in exactly the same way as for
Tcl commands. As a result, the string argument is actually
substituted twice, once by the Tcl parser in the usual
fashion for Tcl commands, and again by the subst command.
If any of the -nobackslashes, -nocommands, or -novariables
are specified, then the corresponding substitutions are not
performed. For example, if -nocommands is specified, no
command substitution is performed: open and close brackets
are treated as ordinary characters with no special
interpretation.
Note: when it performs its substitutions, subst does not
give any special treatment to double quotes or curly braces.
For example, the script
set a 44
subst {xyz {$a}}
returns ``xyz {44}'', not ``xyz {$a}''.
KEYWORDS
backslash substitution, command substitution, variable
substitution
Page 1 (printed 2/19/99)
