dbrow man page

dbrow — select rows from an Fsdb file based on arbitrary conditions

Synopsis

dbrow [-vw] CONDITION [CONDITION...]

Description

Select rows for which all CONDITIONS are true. Conditions are specified as Perl code, in which column names are be embedded, preceded by underscores.

Options

-v
Invert the selection, picking rows where at least one condition does not match.

This module also supports the standard fsdb options:

-d
Enable debugging output.
-w or --warnings
Enable warnings in user supplied code.
-i or --input InputSource
Read from InputSource, typically a file name, or "-" for standard input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue objects.
-o or --output OutputDestination
Write to OutputDestination, typically a file name, or "-" for standard output, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue objects.
--autorun or --noautorun
By default, programs process automatically, but Fsdb::Filter objects in Perl do not run until you invoke the run() method. The "--(no)autorun" option controls that behavior within Perl.
--help
Show help.
--man
Show full manual.

Sample Usage

Input

#fsdb account passwd uid gid fullname homedir shell
johnh * 2274 134 John_Heidemann /home/johnh /bin/bash
greg * 2275 134 Greg_Johnson /home/greg /bin/bash
root * 0 0 Root /root /bin/bash
# this is a simple database

Command

cat DATA/passwd.fsdb | dbrow '_fullname =~ /John/'

Output

#fsdb      account passwd  uid     gid     fullname        homedir shell
johnh   *       2274    134     John_Heidemann  /home/johnh     /bin/bash
greg    *       2275    134     Greg_Johnson    /home/greg      /bin/bash
# this is a simple database
#  | /home/johnh/BIN/DB/dbrow

Bugs

Doesn't detect references to unknown columns in conditions.

END
#' for font-lock mode.
exit 1;

Info

2016-09-05 perl v5.24.0 User Contributed Perl Documentation