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Shell Programming and Scripting

Tip: template for a safe and portable script

 
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Old 03-19-2019
Regarding the du and df:
I have seen an old Unix man page that tells to look up the block size in the /usr/include/**.h files.
Not very user-friendly. In SysV it has always been 512 bytes. I think they wanted to have a small buffer in the kernel driver (and physical sector size was much below 512 bytes at that time).
du -k and df -k seem to be widespread in Unix and are allowed(ignored) in Linux.
But in Solaris, df -k not only changes the values to kilobyte, it also changes the (really bad) SysV-style output to the BSD-style (that BSD Unix and Linux always use).
Being Posix-compliant, e.g. by using my template, df -kP might be quite portable (in Linux even avoids a brain-damaged "split long lines in two even if destination is not a terminal").
 
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LEARN ABOUT LINUX

mkcover

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

NAME

       mkcover - HylaFAX continuation cover page generation command

SYNOPSIS

       /var/spool/hylafax/bin/mkcover qfile template result

DESCRIPTION

       bin/mkcover  is the command invoked by the facsimile server when a continuation cover page is required for an outbound job that is about to
       be retried.  It generates a single POSTSCRIPT(R) page that is imaged according to the remote capabilities  and  transmitted  as	the  cover
       page.  The arguments are:

       qfile	 the job description file for the outbound job.

       template  the cover page template file, as used by the faxcover(1) program.

       result	 the filename where the resultant POSTSCRIPT document should be written.

       The default mkcover command is a shell script that uses awk(1) to parse the job description file and generate the cover page document.  The
       template file may be optionally compressed with compress(1), pack(1), or gzip(1); the filename suffix is used to decide whether or not  the
       template file contains compressed data.

SEE ALSO

       faxq(8), hylafax-config(5), sendq(5)

								   June 20, 1994							MKCOVER(8)