Help with commands


 
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# 1  
Help with commands

Hi, i'm beginner in this area, so i've studied to hard, but still there are a lot of things that i do not understand like:

for example

Code:
cd /globall/okl/codelib/inqload/old unzip REL0003.zip -d /globall/okl/codelib/inqload

1.How many lines of commands are there?
2. Which is the function of command -d in from of that line?


other question...

Code:
if [ $# -lt 2 ]; then
 exit 1;
fi;

this is the first step in a some script, and i misunderstand the the first line.

Thanks, if anyone want to help me.


Moderator's Comments:
Mod Comment Please use code tags next time for your code and data.

Last edited by zaxxon; 08-29-2012 at 05:27 PM.. Reason: code tags
# 2  
there are three commands and not in the correct order ..

Code:
-d /globall/okl/codelib/inqload ( may be syntax error)
cd /globall/okl/codelib/inqload/old
unzip REL0003.zip

// checks if the directory inqload exists or not
Code:
[[ -d /globall/okl/codelib/inqload ]]

// if exists change to specified directory
Code:
cd /globall/okl/codelib/inqload/old

//unzip the zip file
Code:
unzip REL0003.zip




Code:
if [ $# -lt 2 ]; then
exit 1;
fi;

$# = number of command line arguments for the script
exit the script if $# is less than 2
This User Gave Thanks to praveen_reddy For This Post:
# 3  
Actually it is one single command:
Code:
cd somewhere nowhere nowhere

If there were a semicolon in front of the unzip, it were two commands:
Code:
cd somewhere; unzip sth -d targetdir

In this case "somewhere" equals "targetdir", so it is somewhat pointless.
This User Gave Thanks to RudiC For This Post:
# 4  
Further to Other Posters:

There are excess semi-colons in the post. This is Shell not Oracle or Perl. Should be:
Code:
if [ $# -lt 2 ]
then
    exit 1
fi

The script checks whether the number or parameters supplied to the script is less than two, and exits with "exit 1" if this condition is not matched.

Note that Post #3 highlights a missing semi-colon. In the correct context, a semi-colon is an abbreviation for a line break. It it best practice to avoid semi-colons mid-line and to definitely not use semi-colons at the end of a line (one special syntax to the find command excluded).
This User Gave Thanks to methyl For This Post:
# 5  
Thanks guys

Hi again, thanks to all of you, it were helpfull to me. I need to study harder, without doubs.
 

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