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Chet Ramey
153 lines
3.5 KiB
Plaintext
153 lines
3.5 KiB
Plaintext
Newsgroups: comp.os.coherent
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Subject: sh clones evaluated (was Re: C News)
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Organization: Software Tool & Die Netnews Research Center
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References: <138198@allan.sublink.org> <920725204@umunk.GUN.de>
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<9207260813.30@rmkhome.UUCP> <1992Jul27.200244.2456@acme.gen.nz>
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<Bs0x7K.2pp@world.std.com> <9207291604.00@rmkhome.UUCP>
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<Bs84t1.3Fx@world.std.com> <9208011403.38@rmkhome.UUCP>
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I've reevaluated the allegedly-sh-compatible shells I have on hand (sh,
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bash, ash, zsh and a redistributable ksh). bash seems to have improved
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since I last looked at it and seems to run inews and subordinates
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correctly, and passes the diagnostic tests I extracted from inews and
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anne.jones. ash, zsh and redistributable ksh each fail three of the six
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tests. This saddens me, as ash is an elegant and relatively small piece
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of work, whereas bash is bloated and complicated.
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I've enclosed the test scripts (shx?), driver script (shx) and results
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(log) below. A couple caveats: shx4 (a quoting test) uses the C News
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getdate command; there may be newer versions of the shells tested - this
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evaluation is decidedly informal. Here's a quick summary: sh and bash
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passed all tests; ash can't parse "<&$fd" and doesn't understand quoting;
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redistributable ksh dumps core on a newline inside backquotes, doesn't
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understand quoting, and botches waiting on background processes; zsh
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doesn't understand sh quoting (in particular, it sees ! as a job control
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character, even inside quotes), and botches waiting for background
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processes.
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# To unbundle, sh this file
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echo log 1>&2
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sed 's/^X//' >log <<'!'
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X:; ./shx
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sh:
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X<&$fd ok
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nlbq Mon Aug 3 02:45:00 EDT 1992
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bang geoff
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quote 712824302
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setbq defmsgid=<1992Aug3.024502.6176@host>
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bgwait sleep done... wait 6187
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bash:
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X<&$fd ok
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nlbq Mon Aug 3 02:45:09 EDT 1992
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bang geoff
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quote 712824311
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setbq defmsgid=<1992Aug3.024512.6212@host>
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bgwait sleep done... wait 6223
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ash:
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X<&$fd shx1: 4: Syntax error: Bad fd number
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nlbq Mon Aug 3 02:45:19 EDT 1992
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bang geoff
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quote getdate: `"now"' not a valid date
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setbq defmsgid=<1992Aug3.` echo 024521
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bgwait sleep done... wait 6241
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ksh:
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X<&$fd ok
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nlbq ./shx: 6248 Memory fault - core dumped
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bang geoff
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quote getdate: `"now"' not a valid date
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setbq defmsgid=<1992Aug3.024530.6257@host>
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bgwait no such job: 6265
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wait 6265
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sleep done...
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zsh:
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X<&$fd ok
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nlbq Mon Aug 3 02:45:36 EDT 1992
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bang shx3: event not found: /s/ [4]
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quote 712824337
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setbq defmsgid=<..6290@host>
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bgwait shx7: unmatched " [9]
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sleep done...
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X:;
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!
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echo shx 1>&2
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sed 's/^X//' >shx <<'!'
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X#! /bin/sh
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for cmd in sh bash ash ksh zsh
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do
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X echo
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X echo $cmd:
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X for demo in shx?
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X do
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X $cmd $demo
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X done
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done
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!
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echo shx1 1>&2
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sed 's/^X//' >shx1 <<'!'
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X# ash fails this one
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echo -n '<&$fd '
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fd=3
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echo ok <&$fd
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!
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echo shx2 1>&2
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sed 's/^X//' >shx2 <<'!'
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X# pd ksh fails this one
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echo -n "nlbq "
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date=`
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date`
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echo "$date"
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!
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echo shx3 1>&2
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sed 's/^X//' >shx3 <<'!'
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X# zsh fails this one
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echo -n 'bang '
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echo 'geoff tty?? Aug 3 02:35' |
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X sed -e 's/[ ].*//' -e '/!/s/^.*!//'
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!
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echo shx4 1>&2
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sed 's/^X//' >shx4 <<'!'
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X# ash, pd ksh fail this one
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echo -n "quote "
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expiry="now"
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timet="` getdate \"$expiry\" `"
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echo "$timet"
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!
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echo shx5 1>&2
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sed 's/^X//' >shx5 <<'!'
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X# ash, zsh fail this one
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echo -n "setbq "
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host=host
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date="`date`"
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echo defmsgid="`set $date; echo \<$6$2$3.\` echo $4 | tr -d : \`.$$@$host\>`"
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!
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echo shx7 1>&2
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sed 's/^X//' >shx7 <<'!'
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X# pd ksh and zsh fail this one
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echo -n "bgwait "
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X(
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X sleep 2
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X echo -n "sleep done... "
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X) &
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waitcmd="wait $!"
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eval $waitcmd
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echo "$waitcmd"
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!
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echo shx8 1>&2
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sed 's/^X//' >shx8 <<'!'
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X# in case gcx7 is really breaks this shell
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sleep 3
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echo
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!
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exit 0
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