Fix a few formatting brainos and make the formatting of the EXAMPLES
section somewhat clearer.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=92982
@ -142,14 +142,14 @@ command in general is historic and inconvenient.
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New applications are advised to use shell arithmetic rather than
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.Nm .
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.Sh EXAMPLES
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.Bl -enum
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.Bl -bullet
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.It
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The following example (in
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.Xr sh 1
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syntax) adds one to the variable
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.Va a .
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.Va a :
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.Dl a=$(expr $a + 1)
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.Li
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.It
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This will fail if the value if
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.Va a
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is a negative number.
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@ -159,7 +159,7 @@ from being interpreted as options to the
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.Nm
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command, one might rearrange the expression:
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.Dl a=$(expr 1 + $a)
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.Li
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.It
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More generally, parenthesize possibly-negative values:
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.Dl a=$(expr \e( $a \e) + 1)
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.It
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@ -175,7 +175,8 @@ The
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.Li //
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characters resolve this ambiguity.
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.Dl expr \*q//$a\*q \&: '.*/\e(.*\e)'
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.It
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.El
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.Pp
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The following examples output the number of characters in variable
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.Va a .
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Again, if
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@ -183,13 +184,15 @@ Again, if
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might begin with a hyphen, it is necessary to prevent it from being
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interpreted as an option to
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.Nm .
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.Bl -bullet
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.It
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If the
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.Nm
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command conforms to
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.St -p1003.1-2001 ,
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this is simple:
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.Dl expr -- \*q$a\*q \&: \*q.*\*q
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.Li
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.It
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For portability to older systems, however, a more complicated command
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is required:
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.Dl expr \e( \*qX$a\*q \&: \*q.*\*q \e) - 1
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