NAME

rsub — substitute lines or block of text

SYNOPSIS

DESCRIPTION

rsub is shipped to remote machines by rset(1) to provide a standard method of modifying configuration parameters within a file. Two modes of operation are supported: line substitution and block replacement.

Single line replacements are defined by the flags -r and -l, while the content for a text block is provided on STDIN.

The arguments for line substitution are as follows:

-A

Append line if the pattern is not found.

-r

A regular expression matching the line to replace.

-l

The replacement text for a matching line. Newlines are not permitted as part of the replacement string.

ENVIRONMENT

RSUB_DIFF_ARGS

Arguments for diff(1) tool. The default is "-U 2".

RSUB_START RSUB_END

Define the beginning and ending markers when updating a block of text.

EXIT STATUS

The rsub utility exits with one of the following values:

EXAMPLES

Ensure a single configuration parameter is set

$SD/rsub -r '^AllowTcpForwarding .+' -l 'AllowTcpForwarding yes' \
	/etc/ssh/sshd_config

Update a managed block of text

$SD/rsub /etc/fstab <<-CONF
/dev/ada0p1  /vm  ufs  rw  0  0

SEE ALSO

awk(1), rinstall(1)