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authorMartin Cracauer <cracauer@FreeBSD.org>1999-04-04 00:25:39 +0000
committerMartin Cracauer <cracauer@FreeBSD.org>1999-04-04 00:25:39 +0000
commit0ab2a7ae85e2d50dcafed917b86006b751783ca3 (patch)
tree0574a25b4a956dc4a12869c2dfbdfe936353266a /usr.bin/getopt
parent68b7e6e74993c4e1f5a4504151ad3ab2742b7f3b (diff)
downloadsrc-test2-0ab2a7ae85e2d50dcafed917b86006b751783ca3.tar.gz
src-test2-0ab2a7ae85e2d50dcafed917b86006b751783ca3.zip
Notes
Diffstat (limited to 'usr.bin/getopt')
-rw-r--r--usr.bin/getopt/getopt.141
-rw-r--r--usr.bin/getopt/getopt.c2
2 files changed, 16 insertions, 27 deletions
diff --git a/usr.bin/getopt/getopt.1 b/usr.bin/getopt/getopt.1
index 39c79b1e2d19..48be2cc13314 100644
--- a/usr.bin/getopt/getopt.1
+++ b/usr.bin/getopt/getopt.1
@@ -5,9 +5,9 @@
.Nm getopt
.Nd parse command options
.Sh SYNOPSIS
-.Ic set \-\- \`getopt Ar optstring
+.Ic var=\`getopt Ar optstring
.Qq $@
-\`
+\` ; set \-\- $var
.Sh DESCRIPTION
.Nm Getopt
is used to break up options in command lines for easy parsing by
@@ -50,15 +50,17 @@ then
echo 'Usage: ...'
exit 2
fi
-eval set \-\- $tmp
+set \-\- $tmp
for i
do
case "$i"
in
\-a|\-b)
- echo flag $i set; sflags="${i#-}$sflags"; shift;;
+ echo flag $i set; sflags="${i#-}$sflags";
+ shift;;
\-o)
- echo oarg is "'"$2"'"; oarg="$2"; shift; shift;;
+ echo oarg is "'"$2"'"; oarg="$2"; shift;
+ shift;;
\-\-)
shift; break;;
esac
@@ -75,12 +77,6 @@ cmd \-a \-o arg file file
cmd \-oarg -a file file
cmd \-a \-oarg \-\- file file
.Pp
-Test your scripts with calls like this
-.Pp
-cmd \-ab \-o 'f \-z'
-.Pp
-to verify that they work with parameters/filenames that have
-whitespace in them.
.Ed
.Sh SEE ALSO
.Xr sh 1 ,
@@ -100,20 +96,8 @@ Whatever
.Xr getopt 3
has.
.Pp
-It is hard to get command switch parsing right in shell scripts,
-especially with arguments containing whitespace or embedded shell
-metacharacters. This version of
-.Nm getopt
-and the example in this manpage have been fixed to avoid traditional
-problems. They have been tested with
-.Fx
-.Xr sh 1
-and with GNU bash. Note that bash has a builtin
-.Nm getopt .
-In shells with builtin
-.Nm getopt
-you need to call getopt with a full path to get the external version
-described here.
+Arguments containing white space or embedded shell metacharacters
+generally will not survive intact; this looks easy to fix but isn't.
.Pp
The error message for an invalid option is identified as coming
from
@@ -121,4 +105,9 @@ from
rather than from the shell procedure containing the invocation
of
.Nm getopt ;
-this is hard to fix.
+this again is hard to fix.
+.Pp
+The precise best way to use the
+.Nm set
+command to set the arguments without disrupting the value(s) of
+shell options varies from one shell version to another.
diff --git a/usr.bin/getopt/getopt.c b/usr.bin/getopt/getopt.c
index 19c21f853baf..060e2c9ce17f 100644
--- a/usr.bin/getopt/getopt.c
+++ b/usr.bin/getopt/getopt.c
@@ -17,7 +17,7 @@ char *argv[];
break;
default:
if (optarg != NULL)
- printf(" -%c '%s'", c, optarg);
+ printf(" -%c %s", c, optarg);
else
printf(" -%c", c);
break;