thormod@dr.uucp (Thormod N{ringsrud) (01/12/90)
Suggestion to enhance /bin/sh
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I often have a need to pick up the last parameter $1, $2 .. from
the parameter list. I have tried to catch it by referring $$#
which gives me "processnumber"#. Then I tried ${$#} which I really
thought would work, but got instead the message: bad variabel substitution.
What I really want is a new special variabel: $. (dollarpoint) giving
me the last parameter in the list.
Thormod N{ringsrud
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+-------------------------------------------------------------+chris@mimsy.umd.edu (Chris Torek) (01/16/90)
In article <620@dr.uucp> thormod@dr.uucp (Thormod N{ringsrud) writes: >I often have a need to pick up the last parameter $1, $2 .. from >the parameter list. It looks like `eval $"$#"' would do it: $ set foo bar baz $ eval echo $"$#" baz but for a small problem with sh argument syntax: $ set a b c d e f g h i j k l $ echo $11 a1 $ `$11' means `${1}1', and not ${11}. (Trying `${11}' directly gives `bad substitution'.) The only reliable way to get at the last parameter is something like for i do last="$i"; done -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163) Domain: chris@cs.umd.edu Path: uunet!mimsy!chris
cpcahil@virtech.uucp (Conor P. Cahill) (01/16/90)
In article <620@dr.uucp>, thormod@dr.uucp (Thormod N{ringsrud) writes: > I often have a need to pick up the last parameter $1, $2 .. from > the parameter list. I have tried to catch it by referring $$# > which gives me "processnumber"#. Then I tried ${$#} which I really > thought would work, but got instead the message: bad variabel substitution. The following will work in /bin/sh: `eval echo \\\${$#}` Not easy to type, but it works for shells. -- +-----------------------------------------------------------------------+ | Conor P. Cahill uunet!virtech!cpcahil 703-430-9247 ! | Virtual Technologies Inc., P. O. Box 876, Sterling, VA 22170 | +-----------------------------------------------------------------------+
maart@cs.vu.nl (Maarten Litmaath) (01/16/90)
In article <620@dr.uucp>, thormod@dr.uucp (Thormod N{ringsrud) writes: \... I often have a need to pick up the last parameter $1, $2 .. from \the parameter list. [...] eval last=\"\$$#\" -- Q: "How do I convert UNIX files to IXUN format?" A: "rev | dd conv=swab." | Maarten Litmaath @ VU Amsterdam: maart@cs.vu.nl, uunet!mcsun!botter!maart
gwyn@smoke.BRL.MIL (Doug Gwyn) (01/16/90)
In article <620@dr.uucp> thormod@dr.uucp (Thormod N{ringsrud) writes: >What I really want is a new special variabel: $. (dollarpoint) giving >me the last parameter in the list. echo `eval echo $"$#"`
maart@cs.vu.nl (Maarten Litmaath) (01/16/90)
In article <21838@mimsy.umd.edu>, chris@mimsy.umd.edu (Chris Torek) writes: \... \ $ eval echo $"$#" \... \but for a small problem with sh argument syntax: \ \ $ set a b c d e f g h i j k l \ $ echo $11 \ a1 A ridiculous feature which should have been fixed long ago... Similar: exec 10< foo 11> bar -- Q: "How do I convert UNIX files to IXUN format?" A: "rev | dd conv=swab." | Maarten Litmaath @ VU Amsterdam: maart@cs.vu.nl, uunet!mcsun!botter!maart