Is there any tool in which I can place the script and it can tell me the meaning of the whole script?
Yes, there is: it is called "scripting learning device", or, by its old name, "book". I suggest you get one and start reading.
Make sure that you are learning the right shell, though. In the first line of the script there should be a "shebang" identifying the shell to use, for example:
Code:
#! /usr/bin/bash
<...rest of the script....>
Widespread alternatives to this would be "ksh" (Korn Shell) or "sh" (either Bourne shell or the systems default shell, whatever that may be).
Most of the syntax is the same in these shells (they are all derived from the Bourne shell) but in some details they are different.
Hello all,
Could any one let me know where to find exercises(problems to solve) both simple and complex ones that would eventually help me learn Shell scripting.I'm just a beginner:o in shell scripting but would love to learn more..
Thanks,
Triji (2 Replies)
I am trying to write a small (and rather simple) script to gather some info about the system and piping it to dzen2
first, i want to explain some things.
I know i could have used conky, but my intention was to expand my knowledge of bash, pipes and redirections inside a script, and to have fun... (14 Replies)
Hi folks,
I'm a CS students enrolled in a sysadmin class where we've been covering bash scripting for the past few weeks. I have prior knowledge in java, c++, c#, python,and some scripting languages like asp.net w/c# and php. This bash stuff seems pretty neat and a bit different than what I am... (9 Replies)
I am beginner to the SHELL SCRIPT and want to Learn SHELL SCRIPT Basics.
This thread should help to all beginners who want to learn SHELL SCRIPT
*** Thanks in advance to those who will contribute on this thread ***
Please guide me and all beginners...
1. Is there any good e-book... (3 Replies)
I'm going to be starting a job in a month or so that I need to brush up on my Unix shell scripting skills. About 15 years ago, I took a college class for Unix shell scripting. I would like to find a good college book again, rather than just going to Amazon and just buying anything.
This is... (2 Replies)
Hi Guys,
I know basic command of unix and basic programming of unix as like using for loop, while loop, if..else, case statement etc. then how to learn unix shell scripting as well as use also. (1 Reply)
Discussion started by: aaditya321
1 Replies
LEARN ABOUT FREEBSD
ddb
DDB(8) BSD System Manager's Manual DDB(8)NAME
ddb -- configure DDB kernel debugger properties
SYNOPSIS
ddb capture [-M -core] [-N -system] print
ddb capture [-M -core] [-N -system] status
ddb script scriptname
ddb script scriptname=script
ddb scripts
ddb unscript scriptname
ddb pathname
DESCRIPTION
The ddb utility configures certain aspects of the ddb(4) kernel debugger from user space that are not configured at compile-time or easily
via sysctl(8) MIB entries.
To ease configuration, commands can be put in a file which is processed using ddb as shown in the last synopsis line. An absolute pathname
must be used. The file will be read line by line and applied as arguments to the ddb utility. Whitespace at the beginning of lines will be
ignored as will lines where the first non-whitespace character is '#'.
OUTPUT CAPTURE
The ddb utility can be used to extract the contents of the ddb(4) output capture buffer of the current live kernel, or from the crash dump of
a kernel on disk. The following debugger commands are available from the command line:
capture [-M core] [-N system] print
Print the current contents of the ddb(4) output capture buffer.
capture [-M core] [-N system] status
Print the current status of the ddb(4) output capture buffer.
SCRIPTING
The ddb utility can be used to configure aspects of ddb(4) scripting from user space; scripting support is described in more detail in
ddb(4). Each of the debugger commands is available from the command line:
script scriptname
Print the script named scriptname.
script scriptname=script
Define a script named scriptname. As many scripts contain characters interpreted in special ways by the shell, it is advisable to
enclose script in quotes.
scripts
List currently defined scripts.
unscript scriptname
Delete the script named scriptname.
EXIT STATUS
The ddb utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
The following example defines a script that will execute when the kernel debugger is entered as a result of a break signal:
ddb script kdb.enter.break="show pcpu; bt"
The following example will delete the script:
ddb unscript kdb.enter.break
For further examples, see the ddb(4) and textdump(4) manual pages.
SEE ALSO ddb(4), textdump(4), sysctl(8)HISTORY
The ddb utility first appeared in FreeBSD 7.1.
AUTHORS
Robert N M Watson
BUGS
Ideally, ddb would not exist, as all pertinent aspects of ddb(4) could be configured directly via sysctl(8).
BSD December 24, 2008 BSD