root@oakhill.sps.mot.com (Operator) (04/25/91)
Hello all --
I was asked by a user how to retrieve/identify the unique
user number from within the shell environment (ksh). What
he is looking for would, preferably, function in much the
same fashion as the command [echo `/usr/bin/logname`], where
the result of this op could then be piped into a subsequent
operation.
If I properly understand his request, what he is trying to
avoid is invoking an awk script to execute a search of the
/etc/passwd file; however, if an embedded shell command is
not available to fulfill this purpose, then awk it is.
Many thanks,
Vance
--
"I like this company - they hired me, for one; besides that,
they haven't asked me to speak for them - so I won't."
/**************************************************************
* Vance R. Fields III | Motorola SPS *hansm@cs.kun.nl (Hans Mulder) (04/26/91)
In <1991Apr25.153217.9572@oakhill.sps.mot.com> root@oakhill.sps.mot.com (Operator) writes: >Hello all -- >I was asked by a user how to retrieve/identify the unique >user number from within the shell environment (ksh). What >he is looking for would, preferably, function in much the >same fashion as the command [echo `/usr/bin/logname`], where >the result of this op could then be piped into a subsequent >operation. On this system (running SunOS 4.1.1) id | sed 's/[^=]*=//;s/(.*//' tells you your uid. You didn't say what OS you are running. The man page for id(1v) suggest that it is a SysVism, so it may not be available on your system. If you're worried about the efficiency of invoking sed, you'll have to write a C program that prints the output of the getuid() system call. BTW, is there any difference between echo `/usr/bin/logname` and logname ?? In general, the echo `...` constructs reduces whitespace, but your users don't have whitespace in their login names, have they? >Many thanks, You're welcome >Vance Hans Mulder hansm@cs.kun.nl
goldfish@concour.cs.concordia.ca (Paul Goldsmith) (04/26/91)
I have a small C program I wrote to find free USER numbers with range checks and format options. I posted it to the Comp.Sys.Apollo group a while ago. Please send me E-Mail if you want a copy. -- -- Paul Goldsmith <goldfish@concour.cs.concordia.ca> (514) 848-3031 (Shirley Maclaine told me there would be LIFETIMES like this)
mike@bria.UUCP (Michael Stefanik) (04/27/91)
In an article, root@oakhill.sps.mot.com (Operator) writes: |I was asked by a user how to retrieve/identify the unique |user number from within the shell environment (ksh). What |he is looking for would, preferably, function in much the |same fashion as the command [echo `/usr/bin/logname`], where |the result of this op could then be piped into a subsequent |operation. How about ... myuid() { expr "`id`" : 'uid=\([0-9]*\).*' } echo "My uid is `myuid`" -- Michael Stefanik, MGI Inc, Los Angeles | Opinions stated are never realistic Title of the week: Systems Engineer | UUCP: ...!uunet!bria!mike ------------------------------------------------------------------------------- If MS-DOS didn't exist, who would UNIX programmers have to make fun of?
subbarao@phoenix.Princeton.EDU (Kartik Subbarao) (04/28/91)
In article <3483@wn1.sci.kun.nl> hansm@cs.kun.nl (Hans Mulder) writes: >In <1991Apr25.153217.9572@oakhill.sps.mot.com> root@oakhill.sps.mot.com (Operator) writes: > >>Hello all -- > >>I was asked by a user how to retrieve/identify the unique >>user number from within the shell environment (ksh). What >>he is looking for would, preferably, function in much the >>same fashion as the command [echo `/usr/bin/logname`], where >>the result of this op could then be piped into a subsequent >>operation. > >On this system (running SunOS 4.1.1) > >id | sed 's/[^=]*=//;s/(.*//' Ik ik ik. This looks cooler: % perl -e 'print $<;' And it works on more systems than just SunOS 4.1.1. -Kartik -- internet# rm `df | tail +2 | awk '{ printf "%s/quotas\n",$6}'` subbarao@phoenix.Princeton.EDU -| Internet kartik@silvertone.Princeton.EDU (NeXT mail) SUBBARAO@PUCC.BITNET - Bitnet
cliff@demon.co.uk (Cliff Stanford) (04/28/91)
In article <1991Apr25.153217.9572@oakhill.sps.mot.com> root@oakhill.sps.mot.com (Operator) writes: >I was asked by a user how to retrieve/identify the unique >user number from within the shell environment (ksh). What >he is looking for would, preferably, function in much the >same fashion as the command [echo `/usr/bin/logname`], where >the result of this op could then be piped into a subsequent >operation. echo `grep \^\`/usr/bin/logname\` /etc/passwd | cut -d: -f3` Isn't shell quoting wonderful? :-) Cliff -- Cliff Stanford Email: cliff@demon.co.uk (Work) Demon Systems Limited cms@demon.co.uk (Home) 42 Hendon Lane Phone: 081-349 0063 (Office) London N3 1TT England 0860 375870 (Mobile)