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readproctitle(8)	     System Manager's Manual		readproctitle(8)

NAME
     readproctitle  -  maintains  an automatically rotated log in memory for in-
     spection by ps(1).

SYNOPSIS
     readproctitle L D

DESCRIPTION
     L consists of any number of arguments.  D is one argument consisting of  at
     least five dots.

     readproctitle  reads data into the end of D, shifting D to the left to make
     room. This means that the most recent data is  visible  to  process-listing
     tools such as ps(1).  readproctitle always leaves three dots at the left of
     D.

     For example, if

      readproctitle io errors: ....................

     reads the data

      fatal error xyz
      warning abc

     then its command-line arguments change to

      readproctitle io errors: ... xyz!warning abc!

     with  a  newline  character in place of each !. Process-listing tools typi-
     cally show the newline character as ? or \n.

     readproctitle exits when it reaches the end of input.

     Beware that most implementations of ps(1) have small  argument-length  lim-
     its.  These  limits apply to the total length of readproctitle L D.  I have
     not seen a system with a limit below 512 bytes.

SEE ALSO
     ps(1), envdir(8), envini(8),  envuidgid(8),  fghack(8),  multilog(8),  pgr-
     phack(8), setlock(8), setuidgid(8), setuser(8), softlimit(8), supervise(8),
     svc(8),  svok(8), svscan(8), svscanboot(8), svstat(8), tai64n(8), tai64nlo-
     cal(8)

								readproctitle(8)

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<https://man.freebsd.org/cgi/man.cgi?query=readproctitle&sektion=8&manpath=FreeBSD+Ports+15.1.quarterly>

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