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Annotation of 43BSDReno/bin/sleep/sleep.1, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1990 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted provided
        !             5: .\" that: (1) source distributions retain this entire copyright notice and
        !             6: .\" comment, and (2) distributions including binaries display the following
        !             7: .\" acknowledgement:  ``This product includes software developed by the
        !             8: .\" University of California, Berkeley and its contributors'' in the
        !             9: .\" documentation or other materials provided with the distribution and in
        !            10: .\" all advertising materials mentioning features or use of this software.
        !            11: .\" Neither the name of the University nor the names of its contributors may
        !            12: .\" be used to endorse or promote products derived from this software without
        !            13: .\" specific prior written permission.
        !            14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17: .\"
        !            18: .\"     @(#)sleep.1    6.3 (Berkeley) 7/24/90
        !            19: .\"
        !            20: .Dd July 24, 1990
        !            21: .Dt SLEEP 1
        !            22: .Os BSD 4.4
        !            23: .Sh NAME
        !            24: .Nm sleep
        !            25: .Nd suspend execution for an interval of time
        !            26: .Sh SYNOPSIS
        !            27: .Nm sleep
        !            28: .Ar seconds
        !            29: .Sh DESCRIPTION
        !            30: The
        !            31: .Nm sleep
        !            32: command
        !            33: suspends execution for a minimum of
        !            34: .Ar seconds .
        !            35: .Nm Sleep
        !            36: is used to schedule the execution of other commands (see
        !            37: EXAMPLES below).
        !            38: .Pp
        !            39: The
        !            40: .Nm Sleep
        !            41: utility exits with one of the following values:
        !            42: .Tw Ds
        !            43: .Tp Li \&0
        !            44: On successful completetion, or if the signal SIGALRM was received.
        !            45: .Tp Li \&>\&0
        !            46: An error occurred.
        !            47: .Tp
        !            48: .Sh EXAMPLES
        !            49: To schedule the execution of a command for
        !            50: .Va x
        !            51: number seconds later:
        !            52: .Pp
        !            53: .Dl (sleep 1800; sh command_file >& errors)&
        !            54: .Pp
        !            55: This incantation would wait a half hour before
        !            56: running the script command_file. (See the
        !            57: .Xr at 1
        !            58: utility.)
        !            59: .Pp
        !            60: To reiteratively run a command (with the
        !            61: .Xr csh 1 ) :
        !            62: .Pp
        !            63: .Ds I
        !            64: while (1)
        !            65:        if (! -r zzz.rawdata) then
        !            66:                sleep 300
        !            67:        else
        !            68:                foreach i (`ls *.rawdata`)
        !            69:                        sleep 70
        !            70:                        awk -f collapse_data $i >> results
        !            71:                end
        !            72:                break
        !            73:        endif
        !            74: end
        !            75: .De
        !            76: .Pp
        !            77: The scenario for a script such as this might be: a program currently
        !            78: running is taking longer than expected to process a series of
        !            79: files, and it would be nice to have
        !            80: another program start processing the files created by the first
        !            81: program as soon as it is finished (when zzz.rawdata is created).
        !            82: The script checks every five minutes for the file zzz.rawdata,
        !            83: when the file is found, then another portion processing
        !            84: is done curteously by sleeping for 70 seconds in between each
        !            85: awk job.
        !            86: .Sh SEE ALSO
        !            87: .Xr setitimer 2 ,
        !            88: .Xr alarm 3 ,
        !            89: .Xr sleep 3 ,
        !            90: .Xr at 1
        !            91: .Sh STANDARDS
        !            92: The sleep function is expected to be POSIX 1003.2 compatible.

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