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Full Discussion: Referencing variables in commands
Top Forums Shell Programming and Scripting Referencing variables in commands Post 68040 by mharley on Wednesday 30th of March 2005 11:36:56 AM
Old 03-30-2005
Referencing variables in commands
The script I am writing must be able to run several commands (tar, gzip etc) on filenames that are supplied by variables. I am unsure as to what syntax is required/ideal when referencing variables in filenames. The following is a sample command that I would like the script to execute:
Code:
tar cvf bk{fileName}.${DATEyear}${DATEmonth}.tar {fileName}.${DATEyear}${DATEmonth}* >> /ebccsBackupReport.txt

Is this really poor form? The tar filename format must be bkFILENAME.YEARMONTH.tar, where the filename, year and month are variables set earlier in the script.

Also, is there a way to verify where one or more files bearing a variation on a filename exist within the directory? For example, all files under filename.*? I have been using
Code:
if [ -f filename.* ]

but I've been told that this statement is intended more for verifying the existance of a single file, not a range of files.

I'm using Ksh 88 under Solaris 8.

Thanks for all the help.
 

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LEARN ABOUT LINUX

smbtar

SMBTAR(1)                                                          User Commands                                                         SMBTAR(1)

NAME

       smbtar - shell script for backing up SMB/CIFS shares directly to UNIX tape drives

SYNOPSIS

       smbtar [-r] [-i] [-a] [-v] {-s server} [-p password] [-x services] [-X] [-N filename] [-b blocksize] [-d directory] [-l loglevel] [-u user]
        [-t tape] {filenames}

DESCRIPTION

       This tool is part of the samba(7) suite.

       smbtar is a very small shell script on top of smbclient(1) which dumps SMB shares directly to tape.

OPTIONS

       -s server
           The SMB/CIFS server that the share resides upon.

       -x service
           The share name on the server to connect to. The default is "backup".

       -X
           Exclude mode. Exclude filenames... from tar create or restore.

       -d directory
           Change to initial directory before restoring / backing up files.

       -v
           Verbose mode.

       -p password
           The password to use to access a share. Default: none

       -u user
           The user id to connect as. Default: UNIX login name.

       -a
           Reset DOS archive bit mode to indicate file has been archived.

       -t tape
           Tape device. May be regular file or tape device. Default: $TAPE environmental variable; if not set, a file called tar.out .

       -b blocksize
           Blocking factor. Defaults to 20. See tar(1) for a fuller explanation.

       -N filename
           Backup only files newer than filename. Could be used (for example) on a log file to implement incremental backups.

       -i
           Incremental mode; tar files are only backed up if they have the archive bit set. The archive bit is reset after each file is read.

       -r
           Restore. Files are restored to the share from the tar file.

       -l log level
           Log (debug) level. Corresponds to the -d flag of smbclient(1).

ENVIRONMENT VARIABLES

       The $TAPE variable specifies the default tape device to write to. May be overridden with the -t option.

BUGS

       The smbtar script has different options from ordinary tar and from smbclient's tar command.

CAVEATS

       Sites that are more careful about security may not like the way the script handles PC passwords. Backup and restore work on entire shares;
       should work on file lists. smbtar works best with GNU tar and may not work well with other versions.

DIAGNOSTICS

       See the DIAGNOSTICS section for the smbclient(1) command.

VERSION

       This man page is correct for version 3 of the Samba suite.

SEE ALSO

       smbd(8), smbclient(1), smb.conf(5).

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.

       Ricky Poulten wrote the tar extension and this man page. The smbtar script was heavily rewritten and improved by Martin Kraemer. Many
       thanks to everyone who suggested extensions, improvements, bug fixes, etc. The man page sources were converted to YODL format (another
       excellent piece of Open Source software, available at ftp://ftp.icce.rug.nl/pub/unix/) and updated for the Samba 2.0 release by Jeremy
       Allison. The conversion to DocBook for Samba 2.2 was done by Gerald Carter. The conversion to DocBook XML 4.2 for Samba 3.0 was done by
       Alexander Bokovoy.

Samba 3.5                                                           06/18/2010                                                           SMBTAR(1)
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