goto.1

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.th GOTO I 3/15/72
.sh NAME
goto  \*-  command transfer
.sh SYNOPSIS
.bd goto
label
.sh DESCRIPTION
.it Goto
is allowed only when the Shell
is taking commands from a file.
The file is searched from the beginning
for a line beginning with `:' followed by one
or more spaces followed by
the
.it label.
If such a line is found, the
.it goto
command returns.
Since the read pointer in the command file points to the
line after the label,
the effect is to cause the Shell to transfer to the
labelled line.
.s3
`:' is a do-nothing
command that is ignored by the Shell and only serves to place a label.
.sh "SEE ALSO"
sh (I)
.sh BUGS