diff options
Diffstat (limited to 'doc/subst.n')
| -rw-r--r-- | doc/subst.n | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/doc/subst.n b/doc/subst.n index 5a162c4..aba2bc9 100644 --- a/doc/subst.n +++ b/doc/subst.n @@ -62,19 +62,23 @@ itself will either return an error, or will complete successfully. When it performs its substitutions, \fIsubst\fR does not give any special treatment to double quotes or curly braces (except within command substitutions) so the script +.PP .CS set a 44 \fBsubst\fR {xyz {$a}} .CE +.PP returns .QW "\fBxyz {44}\fR" , not .QW "\fBxyz {$a}\fR" and the script +.PP .CS set a "p\e} q \e{r" \fBsubst\fR {xyz {$a}} .CE +.PP returns .QW "\fBxyz {p} q {r}\fR" , not @@ -82,10 +86,12 @@ not .PP When command substitution is performed, it includes any variable substitution necessary to evaluate the script. +.PP .CS set a 44 \fBsubst\fR -novariables {$a [format $a]} .CE +.PP returns .QW "\fB$a 44\fR" , not @@ -93,11 +99,13 @@ not Similarly, when variable substitution is performed, it includes any command substitution necessary to retrieve the value of the variable. +.PP .CS proc b {} {return c} array set a {c c [b] tricky} \fBsubst\fR -nocommands {[b] $a([b])} .CE +.PP returns .QW "\fB[b] c\fR" , not @@ -107,34 +115,42 @@ The continue and break exceptions allow command substitutions to prevent substitution of the rest of the command substitution and the rest of \fIstring\fR respectively, giving script authors more options when processing text using \fIsubst\fR. For example, the script +.PP .CS \fBsubst\fR {abc,[break],def} .CE +.PP returns .QW \fBabc,\fR , not .QW \fBabc,,def\fR and the script +.PP .CS \fBsubst\fR {abc,[continue;expr {1+2}],def} .CE +.PP returns .QW \fBabc,,def\fR , not .QW \fBabc,3,def\fR . .PP Other exceptional return codes substitute the returned value +.PP .CS \fBsubst\fR {abc,[return foo;expr {1+2}],def} .CE +.PP returns .QW \fBabc,foo,def\fR , not .QW \fBabc,3,def\fR and +.PP .CS \fBsubst\fR {abc,[return -code 10 foo;expr {1+2}],def} .CE +.PP also returns .QW \fBabc,foo,def\fR , not @@ -142,4 +158,7 @@ not .SH "SEE ALSO" Tcl(n), eval(n), break(n), continue(n) .SH KEYWORDS -backslash substitution, command substitution, variable substitution +backslash substitution, command substitution, quoting, substitution, variable substitution +.\" Local Variables: +.\" mode: nroff +.\" End: |