shlock(1) [redhat man page]
SHLOCK(1) General Commands Manual SHLOCK(1) NAME
shlock - create lock files for use in shell scripts SYNOPSIS
shlock -p pid -f name [ -b ] [ -u ] [ -c ] DESCRIPTION
Shlock tries to create a lock file named name and write the process ID pid into it. If the file already exists, shlock will read the process ID from the file and test to see if the process is currently running. If the process exists, then the file will not be created. Shlock exits with a zero status if it was able to create the lock file, or non-zero if the file refers to currently-active process. OPTIONS
-b Process IDs are normally read and written in ASCII. If the ``-b'' flag is used, then they will be written as a binary int. For compatibility with other systems, the ``-u'' flag is accepted as a synonym for ``-b'' since binary locks are used by many UUCP pack- ages. -c If the ``-c'' flag is used, then shlock will not create a lock file, but will instead use the file to see if the lock is held by another program. If the lock is valid, the program will exit with a non-zero status; if the lock is not valid (i.e., invoking shlock without the flag would have succeeded), then the program will exit with a zero status. EXAMPLES
The following example shows how shlock would be used within a shell script: LOCK=<pathrun in inn.conf>/LOCK.send trap 'rm -f ${LOCK} ; exit 1' 1 2 3 15 if shlock -p $$ -f ${LOCK} ; then # Do appropriate work else echo Locked by `cat ${LOCK}` fi BUGS
shlock does not assumed to be used under a number of lock/unlock environment in a short time. Namely, shlock should be used for an envi- ronment like daily or hourly based job. HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> after a description of HDB UUCP locking given by Peter Honeyman. This is revision 1.5.6.1, dated 2002/09/24. SEE ALSO
inn.conf(5) SHLOCK(1)
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NNTPSEND(8) System Manager's Manual NNTPSEND(8) NAME
nntpsend - send Usenet articles to remote site SYNOPSIS
nntpsend [ -a ] [ -c ] [ -D ] [ -d ] [ -l ] [ -N ] [ -n ] [ -P portnum ] [ -p ] [ -r ] [ -S ] [ -s size ] [ -T timelimit ] [ -t timeout ] [ -w delay ] [ sitename fqdn ] ... DESCRIPTION
Nntpsend is a front-end that invokes innxmit(1) to send Usenet articles to a remote NNTP site. The sites to be fed may be specified by giving sitename fqdn pairs on the command line. If no such pairs are given, nntpsend defaults to the information given in the nntpsend.ctl config file. The sitename should be the name of the site as specified in the newsfeeds(5) file. The fqdn should be the hostname or IP address of the remote site. An innxmit is launched for sites with queued news. All innxmit processes are spawned in the background and the script waits for them all to finish before returning. Output is sent to the file <pathlog in inn.conf>/nntpsend.log. In order to keep from overwhelming the local system, nntpsend waits five seconds before spawning each child. Nntpsend expects that the batchfile for a site is named <pathoutgoing in inn.conf>/sitename. To prevent batchfile corruption, shlock(1) is used to ``lock'' these files. When sitename fqdn pairs are given on the command line, any flags given on the command completely describe how innxmit and shrinkfile oper- ate. When no such pairs are given on the command line, then the information found in nntpsend.ctl becomes the default flags for that site. Any flags given on the command line override the default flags for the site. OPTIONS
-d -D The ``-d'' flag causes nntpsend to send output to stdout rather than the log file <pathlog in inn.conf>/nntpsend.log. The ``-D'' flag does the same and it passes ``-d'' to all innxmit invocations, which in turn causes innxmit to go into debug mode. -n If the ``-n'' flag is used, then nntpsend does not use shlock(1) and does not lock batch files. -s size If the ``-s'' flag is used, then shrinkfile(1) will be invoked to perform a head truncation on the batchfile and the flag will be passed to it. -w delay If the ``-w'' flag is used, then nntpsend waits for delay seconds after flushing the site before launching innxmit. -a -c -l -N -P -p -r -S -T -t The ``-a'', ``-c'', ``-l'', ``-P'', ``-p'', ``-r'', ``-S'', ``-T'' and ``-t'' flags are passed on to the child innxmit program. The ``-N'' flag is passed as ``-s'' flag to the child innxmit program. See innxmit(8) for more details. Note that if the ``-p'' flag is used then no connection is made and no articles are fed to the remote site. It is useful to have cron(8) invoke nntpsend with this flag in case a site cannot be reached for an extended period of time. EXAMPLES
With the following nntpsend.ctl(5) control file: nsavax:erehwon.nsavax.gov::-S -t60 group70:group70.org:: walldrug:walldrug.com:4m-1m:-T1800 -t300 kremvax:kremvax.cis:2m: The command: nntpsend will result in the following: Sitename Truncation Innxmit flags nsavax (none) -a -S -t60 group70 (none) -a -t180 walldrug 1m if >4m -a -T1800 -t300 kremvax 2m -a -t180 The command: nntpsend -d -T1200 will result in the following: Sitename Truncation Innxmit flags nsavax (none) -a -d -S -T1200 -t60 group70 (none) -a -d -T1200 -t180 walldrug 1m if >4m -a -d -T1200 -t300 kremvax 2m -a -d -T1200 -t180 The command: nntpsend -s 5m -T1200 nsavax erehwon.nsavax.gov group70 group70.org will result in the following: Sitename Truncation Innxmit flags nsavax 5m -a -T1200 -t180 group70 5m -a -T1200 -t180 Remember that ``-a'' is always given, and ``-t'' defaults to 180. HISTORY
Written by Landon Curt Noll <chongo@toad.com> and Rich $alz <rsalz@uunet.uu.net> for InterNetNews. This is revision 5909, dated 2002-12-03. SEE ALSO
inn.conf(5), innxmit(1), newsfeeds(5), nntpsend.ctl(5), shrinkfile(1). NNTPSEND(8)