subst(n) Tcl Built-In Commands subst(n)______________________________________________________________________________NAMEsubst - Perform backslash, command, and variable substitutions
SYNOPSISsubst ?-nobackslashes? ?-nocommands? ?-novariables? string
_________________________________________________________________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 speci‐
fied, then the corresponding substitutions are not performed. For
example, if -nocommands is specified, no command substitution is per‐
formed: open and close brackets are treated as ordinary characters
with no special interpretation.
Note: when it performs its substitutions, subst does not give any spe‐
cial 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
Tcl 7.4 subst(n)