if elseif fi Post: 302485409

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Top Forums Shell Programming and Scripting if elseif fi Post 302485409 by methyl on Wednesday 5th of January 2011 06:50:23 AM

01-05-2011

Registered User

There were a number of issues (missing "then", orphaned "elif" , wrong answer displayed etc.). In the end it is much easier to use a "case" statement for the options.
For rapid testing I have surrounded this example menu in a do-done loop and removed lots of "exit" statements. There are now no "else" or "elif" statements in the script which makes it much easier to follow.

Code:

while true
do

echo ""
echo "1.FILE PERMISSION"
echo "2.FILE INODE NUMBER"
echo "3.FILE SIZE"
echo "4.FILE OWNER"
echo " Enter what do you want from the option"
read num

case $num in
1)
    echo " Enter filename you want permissions for : "
    read file1
    if [ ! -f $file1 ]
    then
        echo " FILE NOT FOUND"
    fi
    echo " FILE PERMISSIONS for $file1 = `ls -ltr $file1 | awk '{print $1}'` "
    ;;
2)
    echo " Enter filename for which you want INODE NUMBER for : "
    read file1
    if [ ! -f $file1 ]
    then
        echo " FILE NOT FOUND"
    fi
    echo " FILE INODE NUMBER for $file1 = `ls -il $file1 | awk '{print $1}'` "
    ;;
3)
    echo " Enter filename for which you want SIZE  : "
    read file1
    if [ ! -f $file1 ]
    then
        echo " FILE NOT FOUND"
    fi
    echo " FILE SIZE for $file1 = `ls -lad $file1 | awk '{print $5}'` "
    ;;
4)
    echo " Enter filename for which you want OWNER for : "
    read file1
    if [ ! -f $file1 ]
    then
        echo " FILE NOT FOUND"
    fi
    echo " FILE OWNER for $file1 = `ls -lad $file1 | awk '{print $3}'` "
    ;;
*)
    echo "You have not chosen from the list"
    exit 0
    ;;
esac
#
done

@gcvinayak
Please start a new thread in future. Just realised that this is a completely different subject.

Last edited by methyl; 01-05-2011 at 07:57 AM..

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LEARN ABOUT CENTOS

if

if(n)							       Tcl Built-In Commands							     if(n)

__________________________________________________________________________________________________________________________________________________

NAME

       if - Execute scripts conditionally

SYNOPSIS

       if expr1 ?then? body1 elseif expr2 ?then? body2 elseif ... ?else? ?bodyN?
_________________________________________________________________

DESCRIPTION

       The  if command evaluates expr1 as an expression (in the same way that expr evaluates its argument).  The value of the expression must be a
       boolean (a numeric value, where 0 is false and anything is true, or a string value such as true or yes for true and false or no for false);
       if it is true then body1 is executed by passing it to the Tcl interpreter.  Otherwise expr2 is evaluated as an expression and if it is true
       then body2 is executed, and so on.  If none of the expressions evaluates to true then bodyN is executed.  The then and else  arguments  are
       optional  "noise  words" to make the command easier to read.  There may be any number of elseif clauses, including zero.  BodyN may also be
       omitted as long as else is omitted too.	The return value from the command is the result of the body script that was executed, or an  empty
       string if none of the expressions was non-zero and there was no bodyN.

EXAMPLES

       A simple conditional:
	      if {$vbl == 1} { puts "vbl is one" }

       With an else-clause:
	      if {$vbl == 1} {
		 puts "vbl is one"
	      } else {
		 puts "vbl is not one"
	      }

       With an elseif-clause too:
	      if {$vbl == 1} {
		 puts "vbl is one"
	      } elseif {$vbl == 2} {
		 puts "vbl is two"
	      } else {
		 puts "vbl is not one or two"
	      }

       Remember, expressions can be multi-line, but in that case it can be a good idea to use the optional then keyword for clarity:
	      if {
		 $vbl == 1 || $vbl == 2 || $vbl == 3
	      } then {
		 puts "vbl is one, two or three"
	      }

SEE ALSO

       expr(n), for(n), foreach(n)

KEYWORDS

       boolean, conditional, else, false, if, true

Tcl																	     if(n)