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Top Forums Shell Programming and Scripting Files test How to recover a specific variable Post 302981918 by rovf on Wednesday 21st of September 2016 08:27:17 AM
Old 09-21-2016
Quote:
Originally Posted by Arnaudh78
Thank for your reply, I use #!/bin/bash, So I work in Bash ? I'm beginner, I'm open at all.what do you recommend?
This depends on how you invoke your script.

If the script as executable rights, and you invoke it by typing the script name, the #! line defines, which language processor will be used to run your script. In your case, it is the bash executable stored in the /bin directory.

Alternatively, you can invoke the language processor to be used explicitly from the command line. For instance, if I write bash myfile, the file myfile should better be a bash script (and not zsh or ksh or awk....), as it will be executed under bash. The same applies to other languages - zsh, perl, ruby, ....

Now as for the recommendation. It is difficult to give a recommendation without starting a language war, because most programmers seem to be very picky when it comes to choosing one language over another, and everyone has his favorite pet, so note that I give here only my personal opinion, and others might advice you differently.

As for shell programming, after having had long experience with bash and a little bit experience with ksh, csh and tcsh, I turned to zsh, because I found that quite a few things are simpler to do in zsh than in the other languages. I yet have to see something which is easier to do in bash than in zsh (there must be something). The main drawback of zsh is that fewer people use it, so if you get stuck, you might have to search longer for someone to help. However, I got every zsh question answered by someone so far.

As second language, I tend to use Ruby (after having collected experience with awk, Perl, Python and Tcl), because I found it more expressive than the others and much easier to learn.

Of course one thing to consider it, where your script will run, and how much control you have on the software at the target machine. If I know that there is no zsh installed on the target machine, and I don't even have an account there, it would not be wise to deliver a zsh script. Having said this, even when using bash, you should make sure that you either develop your scripts with the same bash version than the one available on the target host, or write your scripts in a way that they will likely run under each version. This might turn out to be difficult, in particular for someone who doesn't have much experience yet.

If you run your programs only on your own machine, it is up to you what tools you choose.
 

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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 displayed 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 the dialogue in this file. If no filename is given, the dialogue is saved in the file type- script. OPTIONS
-a, --append Append the output to file or to 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 (do not write start and done messages to standard output). -t[file], --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 Display version information and exit. -h, --help Display help text and exit. NOTES
The script ends when the forked shell exits (a control-D for 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. It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for example the .profile file, which is read by login shells only: if test -t 0 ; then script exit fi You should also avoid use of script in command pipes, as script can read more input than you would expect. 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. script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See the NOTES section for more information. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux June 2014 SCRIPT(1)
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