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Full Discussion: While loop
Top Forums Shell Programming and Scripting While loop Post 302932452 by Chubler_XL on Wednesday 21st of January 2015 04:01:52 PM
Old 01-21-2015
If you want to change the current directory in you terminal shell you will need a function.

Here is a bash solution:

Code:
$ pwd
/users/chubler

$ tail hist1.dat
3 4 1

$ function waitHist() {
>   while true
>   do
>      tail -1 hist1.dat | awk '$2==4{exit 1}' || break
>      sleep 1
>   done
>   echo "Complete"
>   cd /users/
> }

$ waitHist
Complete

$ pwd
/users

---------- Post updated at 07:01 AM ---------- Previous update was at 06:22 AM ----------

I also managed to get this working with a alias in csh however I did need to set a variable ($D) to the dollar symbol first:

Code:
$ tail -1 hist1.dat
2 4 6

$ pwd
/users/chubler

$ set D = \$ ; alias waitHist "set x = 1\
?  while ( ${D}x != 4 )\
?    tail -1 hist1.dat | awk '${D}2==4{exit 1}' || break\
?    sleep 2\
?  end\
? echo 'done'\
? cd /users/ "

$ waitHist
done

$ pwd
/users/

This User Gave Thanks to Chubler_XL For This Post:
Prani
 

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LEARN ABOUT SUNOS

pwd

pwd(1)								   User Commands							    pwd(1)

NAME

       pwd - return working directory name

SYNOPSIS

       /usr/bin/pwd

DESCRIPTION

       The pwd utility writes an absolute path name of the current working directory to standard output.

       Both the Bourne shell, sh(1), and the Korn shell, ksh(1), also have a built-in pwd command.

ENVIRONMENT VARIABLES

       See  environ(5)	for  descriptions  of the following environment variables that affect the execution of pwd: LANG, LC_ALL, LC_MESSAGES, and
       NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

       If an error is detected, output will not be written to standard output, a diagnostic message will be written to	standard  error,  and  the
       exit status will not be	0.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cd(1), ksh(1), sh(1), shell_builtins(1), attributes(5), environ(5), standards(5)

DIAGNOSTICS

       ``Cannot open ..'' and ``Read error in ..'' indicate possible file system trouble and should be referred to a UNIX system administrator.

NOTES

       If  you move the current directory or one above it,  pwd may not give the correct response. Use the  cd(1) command with a full path name to
       correct this situation.

SunOS 5.10							    28 Mar 1995 							    pwd(1)
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