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Top Forums Shell Programming and Scripting Tip: template for a safe and portable script Post 303032528 by MadeInGermany on Tuesday 19th of March 2019 04:22:58 PM
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").
 
script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.10 30 Jan 2004 script(1)
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