SYNOPSIS

       usually patternfile

DESCRIPTION

       usually  copies  lines  from  stdin to stdout.  It expects each line to
       match at least one of the patterns listed in patternfile.   If  a  line
       does not match, usually prints it to stderr.

       To  keep  its  memory  use bounded, usually truncates long lines to 500
       characters before checking them against patternfile and  printing  them
       to stderr.  It does not truncate the copy printed to stdout.

       If usually receives a HUP signal, it reads patternfile again.

PATTERNS

       patternfile  contains  a set of patterns, one pattern per line.  A pat-
       tern is a string of characters and wildcards.  A wildcard  matches  any
       string  of  characters  that does not include the next character in the
       pattern.

       For example, the pattern

       * tcpcontrol: ok * *:*:25 *

       matches any line that consists of (1) non-space characters followed  by
       a  space;  (2)  tcpcontrol:_ok_; (3) non-space characters followed by a
       space; (4) non-colon characters followed  by  a  colon;  (5)  non-colon
       characters  followed  by  a colon; (6) 25_; and (7) any characters fol-
       lowed by a newline.

       usually always matches blank lines and partial final lines.

SEE ALSO

       writeerr(1)



                                                                    usually(1)