jack@cs.glasgow.ac.uk (Jack Campin) (02/10/89)
Does anyone know what protocol ksh uses for sharing the history file when running multiple sessions? I cannot make sense of what I see happening. Does it act differently for shells run from distinct NFS clients than when all shells are on the same machine? Is there any concurrency control at all? (Then again, this is on Suns, and given the dog's breakfast they've served up for doing locking, it may not be ksh's fault). Also, is there any way to switch between different history files *within* a shell? My motivation - to use /dev/null for a while so sourced-in function definitions don't clutter up the real one. -- Jack Campin * Computing Science Department, Glasgow University, 17 Lilybank Gardens, Glasgow G12 8QQ, SCOTLAND. 041 339 8855 x6045 wk 041 556 1878 ho INTERNET: jack%cs.glasgow.ac.uk@nss.cs.ucl.ac.uk USENET: jack@glasgow.uucp JANET: jack@uk.ac.glasgow.cs PLINGnet: ...mcvax!ukc!cs.glasgow.ac.uk!jack
davidsen@steinmetz.ge.com (William E. Davidsen Jr) (02/15/89)
In article <2401@crete.cs.glasgow.ac.uk> jack@cs.glasgow.ac.uk (Jack Campin) writes: | Does anyone know what protocol ksh uses for sharing the history file when | running multiple sessions? I cannot make sense of what I see happening. Does | it act differently for shells run from distinct NFS clients than when all | shells are on the same machine? Is there any concurrency control at all? If you want to have separate history files for each session (I usually run 3-5 connections on Xenix virtual terminals) you can do so by setting the name of the HISTFILE variable. You can use something as simple as the PID, or something a bit more informative, such as HISTFILE="/tmp/hist.$(basename $(tty))" The advantage of this (at least with virtual terminals) is that you keep the same history file for each terminal. Please note that you have to set HISTFILE *before* setting the editing option, like "set -o emacs" or vi. -- bill davidsen (wedu@ge-crd.arpa) {uunet | philabs}!steinmetz!crdos1!davidsen "Stupidity, like virtue, is its own reward" -me