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Top Forums UNIX for Advanced & Expert Users same file being opened by two users at a time Post 302272584 by paresh n doshi on Wednesday 31st of December 2008 03:34:03 AM
Old 12-31-2008
same file being opened by two users at a time

I want to avoid a situation where because two users simultaneously
open a file and modify and save, leaving the original file in mess.
Is there a way in UNIX to warn a user if that particular file is already being
used by another user.

Thanks in advance
 

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TM(1)							      General Commands Manual							     TM(1)

NAME
tm - meditate SYNOPSIS
tm [-number] [time] DESCRIPTION
Tm causes UNIX to go into a state in which all current activities are suspended for time minutes (default is 20). At the beginning of this period, tm generates a set of number (default 3) transcendental numbers. Then it prints a two- to six-character nonsense syllable (mantra) on every logged-in terminal (a different syllable on each terminal). For the remainder of the time interval, it repeats these numbers to itself, in random order, binary digit by binary digit (memory permitting), while simultaneously contemplating its kernel. It is suggested that users utilize the time thus provided to do some meditating themselves. One possibility is to close one's eyes, attempt to shut out one's surroundings, and concentrate on the mantra supplied by tm. At the end of the time interval, UNIX returns to the suspended activities, refreshed and reinvigorated. Hopefully, so do the users. FILES
Tm does not use any files, in an attempt to isolate itself from external influences and distractions. DIAGNOSTICS
If disturbed for any reason during the interval of meditation, tm locks the keyboard on every terminal, prints an unprintable expletive, and unlocks the keyboard. Subsequent UNIX operation may be marked by an unusual number of lost or scrambled files and dropped lines. BUGS
If number is greater than 32,767 (decimal), tm appears to generate rational numbers for the entire time interval, after which the behavior of the system may be completely irrational (i.e., transcendental). WARNING
Attempts to use flog(1) on tm are invariably counterproductive. TM(1)
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