.\"  Copyright (C) 2007-2012 Nippon Telegraph and Telephone Corporation.
.\"  Written by Ryusuke Konishi <konishi.ryusuke@gmail.com>
.\"
.TH CHCP 8 "Jan 2026" "nilfs-utils version 2.3"
.SH NAME
chcp \- change mode of NILFS2 checkpoints
.SH SYNOPSIS
.B chcp
[\fIoptions\fP] \fBcp\fP | \fBss\fP [\fIdevice\fP|\fInode\fP] \fIcheckpoint-number\fP ...
.SH DESCRIPTION
.B chcp
is a utility to change the mode of the given checkpoints for the NILFS2
file system found in \fIdevice\fP.
.I device
may be a block device or a filesystem node (file or directory) on the
filesystem.
.B chcp
changes checkpoints to snapshots, or vice versa.  The target
checkpoints are specified with one or more checkpoint numbers.  When
\fIdevice\fP is omitted, it tries to find a NILFS2 file system from
\fI/proc/mounts\fP.
.PP
This command is valid only for mounted NILFS2 file systems, and
will fail if the \fIdevice\fP has no active mounts.
.SH OPTIONS
.TP
\fB\-h\fR, \fB\-\-help\fR
Display help message and exit.
.TP
\fB\-V\fR, \fB\-\-version\fR
Display version and exit.
.SH AUTHOR
Koji Sato
.SH AVAILABILITY
.B chcp
is part of the nilfs-utils package and is available from
https://nilfs.sourceforge.io.
.SH SEE ALSO
.BR nilfs (8),
.BR lscp (1),
.BR mkcp (8),
.BR rmcp (8),
.BR nilfs-tune (8).