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Full Discussion: Understanding Functions, sh, and arguments
Homework and Emergencies Homework & Coursework Questions Understanding Functions, sh, and arguments Post 302472136 by ctsgnb on Tuesday 16th of November 2010 11:05:18 AM
Old 11-16-2010
Code:
#!/bin/sh

addnumbers()
{ if [ $# -eq 2 ]; then          
#in this line space after "[" and before "]" are important! $# stand for the number of arguments
sum=`expr $1 + $2`            
#in this line Do not use space befor and after "=" and use back quote instead of single quote
#not that inside the function, $1 and $2 stand for the parameter of your function !!!
echo $sum
else
echo "Please only enter two arguments."
fi
}

# if you define a function and then never call it, then your script will never give you an output so in the following line, we are calling the function
addnumbers $1 $2           
#in this line, $1 and $2 stand for the parameter of your script !!!

Code:
$ cat myfile
#!/bin/sh

addnumbers()
{ if [ $# -eq 2 ]; then
sum=`expr $1 + $2`
echo $sum
else
echo "Please only enter two arguments."
fi
}
addnumbers $1 $2
$ sh myfile 4 5
9
$

if you run it $ ./myfile 3 4, you will need it to have the execution right

but if you run it $ sh myfile 3 4 , then the read permission are sufficient since sh has the execute permissions to run it.
Last edited by ctsgnb; 11-16-2010 at 12:17 PM..
This User Gave Thanks to ctsgnb For This Post:
lee.n.doan
 

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LEARN ABOUT REDHAT

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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