wohler@sapwdf.UUCP (Bill Wohler) (02/12/91)
folks,
in ksh, i'd like to say "history 30" to print the last 30 commands as
in csh. if you know how to do this, i would be obliged.
the problem is that the "fc -l" command optionally asks for the first
and last command of your list. there aren't any variables that i
know of that contain the current history number which one could subtract
30 from and pass to fc -l.
another "feature" of our ksh is that if you specify a starting
number that is too low, instead of printing just what it knows, it
prints the following useful message (are you listening, ibm?):
/bin/ksh: fc: 0403-009 The specified number is not valid for this command.
thus, such a history alias would have to ensure that it doesn't try
to print commands $HISTSIZE commands ago.
--bw
wohler@sap-ag.demullins@convex.COM (Don Mullins) (02/13/91)
In article <2582@sapwdf.UUCP> Bill Wohler <wohler@sap-ag.de> writes: >folks, > > in ksh, i'd like to say "history 30" to print the last 30 commands as > in csh. if you know how to do this, i would be obliged. > > the problem is that the "fc -l" command optionally asks for the first > and last command of your list. there aren't any variables that i > know of that contain the current history number which one could subtract > 30 from and pass to fc -l. > > --bw > wohler@sap-ag.de I think the -<num> option is what you want (transcript follows..) ------------------------ PROMPT IS '$' ------------------------------- $ alias history history=fc -l $ history -30 15146 cls 15147 lf ..... [deleted for brevity -dwm] 15172 lf 15173 trn 15174 history -20 15175 alias history 15176 history -30 $ what /bin/ksh /bin/ksh Version 11/16/88 sleep.c 4.6 (Berkeley) 9/11/83 $ ---------------------------------------------------------------------- Don -- Don Mullins Convex Computer Corporation Richardson, Texas USA INTERNET: mullins@convex.COM -- UUCP: {uiucuxc, uunet, sun, ...}!convex!mullins Mullins' 1st Law of Statistical Presentation: "Never present numbers as an integer value, people won't believe they're valid."
lvc@cbnews.att.com (Lawrence V. Cipriani) (02/13/91)
In article <2582@sapwdf.UUCP> Bill Wohler <wohler@sap-ag.de> writes: >folks, > > in ksh, i'd like to say "history 30" to print the last 30 commands as > in csh. if you know how to do this, i would be obliged. $ history -30 > another "feature" of our ksh is that if you specify a starting > number that is too low, instead of printing just what it knows, This has been a sore point with me for a long time as well. I have asked Korn to change ksh so that it would do this but it was not done. You could do something like this: ncmd="`history -1 | sed -e 's/[ ].*//' -e 1d`" if [ "$ncmd" -gt "$HISTSIZE" ] then ncmd=$HISTSIZE fi history -$ncmd That's the basic idea at least. -- Larry Cipriani, att!cbvox!lvc or lvc@cbvox.att.com "Fight fire with fire, I always say" -- Bugs Bunny