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RedHat 9 (Linux i386) - man page for nash (redhat section 8)

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

NAME
       nash - script interpretor to interpret linuxrc images

SYNOPSIS
       nash [--quiet] [--force] script

DESCRIPTION
       nash  is  a very simple script interpretor designed to be as small as possible. It is pri-
       marily designed to run simple linuxrc scripts on an initrd image.  Arguments  to  commands
       may  be	enclosed  in either single or double quotes to allow spaces to be included in the
       arguments. Spaces outside of quotations	always	delineate  arguments,  and  so	backslash
       escaping is supported.

       Additionally,  if nash is invoked as modprobe, it will immediately exit with a return code
       of zero. This is to allow initrd's to prevent some extraneous kernel error messages during
       startup.

       There are two types of commands, built in and external. External commands are run from the
       filesystem via execve(). If commands names are given without a path, nash will search it's
       builtin PATH, which is /usr/bin, /bin, /sbin, /usr/sbin.

       Currently, nash supports the following built in commands.

       access -[r][w][x][f] path
	      Tells  whether the current user has sufficient permissions to read, write, or exec-
	      ture path, or if the file exists (see access(2) for more information).

       echo [item]* [> filename]
	      Echos the text strings given to a file, with a space in between each item. The out-
	      put may be optionally redirected to a file.

	      exec <command> The command given is execed, overlaying the nash process.

       find dir -name name
	      Display  the  path  to  files named name in or below directory dir.  This is a very
	      limited implementation of find(1).

       findlodev
	      Prints the full path to the first unused loopback block device on  the  system.  If
	      none is available, no output is displayed.

       losetup /dev/loopdev file
	      Binds  file  to the loopback device /dev/loopdev. See losetup(8) for information on
	      loopback devices.

       mkdevices path
	      Creates device files for all of the block devices listed in /proc/partitions in the
	      directory specfied by path.

       mkdir [-p] path
	      Creates  the  directory path. If -p is specified, this command will not complain if
	      the directory exists. Note this is a subset of the standard mkdir -p behavior.

       mknod path [c|b] major minor
	      Creates a device inode for path. This is identical to mkdev(1) which the exceptions
	      that  it	will  not  create named pipes and if the directories in path do not exist
	      they will be automatically created.

       mkrootdev path
	      Makes path a block inode for the device which should be mounted as root. To  deter-
	      mine  this  device  nash uses the device suggested by the root= kernel command line
	      argument (if root=LABEL is used devices are probed to find one with that label). If
	      no  root= argument is available, /proc/sys/kernel/real-root-dev provides the device
	      number.

       mount [--ro] -o opts -t type device mntpoint
	      Mounts a filesystem. It does not support NFS, and it must be used in the form given
	      above  (arguments  must  go first).  If device is of the form LABEL=foo the devices
	      listed in /fB/proc/partitions will be searched, and the first device with a  volume
	      label  of foo will be mounted. Normal mount(2) options are supported, and --ro will
	      mount the filesystem read only for compatibility with older versions of nash.   The
	      defaults mount option is silently ignored.

       pivot_root newrootpath oldrootpath
	      Makes the filesystem mounted at newrootpath the new root filesystem, and mounts the
	      current root filesystem as oldrootpath.

       raidautorun mddevice
	      Runs raid autodetection on all raid-typed  partitions.  mddevice	must  be  a  raid
	      device (any will do).

       showlabels
	      Display a table of devices, their filesystem labels, and their uuids.

       umount path
	      Unmounts the filesystem mounted at path.

RETURN VALUE
       Returns 0 is the last command succeeded or 1 if it failed.

OPTIONS
       --force
	      Allows  force really execute the script, even though nash doesn't appear to be run-
	      ning from an initrd image.

BUGS
       Probably many. nash is not a shell, and it shouldn't  be  thought  of  as  one.	It  isn't
       entirely different from a shell, but that's mostly by accident.

AUTHOR
       Erik Troan <ewt@redhat.com>

4th Berkeley Distribution		 Sat Mar 27 1999				  NASH(8)


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