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Top Forums Shell Programming and Scripting .sh file syntax checking script Post 302152509 by fabulous2 on Thursday 20th of December 2007 03:54:04 AM
Old 12-20-2007
Quote:
Originally Posted by porter
Mechanism, not policy.
What is that supposed to mean? You only believe in tools supporting mechanisms and not rigid policies?

Assuming that that is the case, I half agree and half disagree with you.

The languages that best tradeoff among productivity, elegance, robustness, maintainability, and performance always make compromises between providing freedom of expression and implementing policies.

XML's runaway rampant success compared to SGML's languishing in obscurity (except for one child, HTML) is precisely because the rigidity of its policies (simple but has to be correct syntax) was wisely chosen. It gave enough freedom of expression to do anything that you want, but limits that expression to a form that is unambiguous and easily parsed.

Java has won out over C++ for many of the same reasons.

Back to shell scripts: I think that robust and safe behavior should be the default, and higher performance options that conflict with this should not. Especially with today's computers. Maybe the choices made 30 years ago with the slow machines of that time were necessary, however.


Quote:
So what was that you said about portability?
I would like this script to be portable, and I think that I have been rationally considering all proposals (e.g. from reborg) to fix it, even if I do not agree with everything he has said so far. I am willing to be educated!


Quote:
Normally they

(a) print usage

(b) say what option was offending

(c) do not try and read your mind.
All of which I agree with. I was talking about experiences with unix that I have had where (b) was left out, and I was left staring for a long time at my input trying to determine why it did not match (a). Thats what I have a problem with.
 

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SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script - make typescript of terminal session SYNOPSIS
script [options] [file] DESCRIPTION
script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file type- script. OPTIONS
-a, --append Append the output to file or typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can supervise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet. -t, --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Output version information and exit. -h, --help Output help and exit. NOTES
The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util- linux/>. util-linux September 2011 SCRIPT(1)
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