for loop and grep question Post: 302309781

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Top Forums Shell Programming and Scripting for loop and grep question Post 302309781 by redalert013 on Wednesday 22nd of April 2009 10:30:45 PM

04-22-2009

Registered User

for loop and grep question

I am trying to work on a script file for tcsh but am fairly new to linux and have several questions.

1. What is the most effective way to set up a type of for loop? I need to run two loops that will each run in steps from a starting value to final value, eg i=0, 1==10, i++ in any other language. What is the most efficient way to set this up?

So far we came up with:
set i_forloopval = `echo "forloop" | awk '{for(p=0.7;p<1.43;p=p+0.08){print p}}'`
set j_forloopval = `echo "forloop" | awk '{for(p=0.9;p<1.81;p=p+0.1){print p}}'`

foreach i ($i_forloopval)
foreach j ($j_forloopval)

but it seems like there must be a more efficient way to go about this.

2. Every time it runs through the loop, it is going to run a program that creates a unique output file. Instead of having to manually search through this file, I was hoping to use grep to search for the line that we need.

A given output might look like:
1\1\GINC-NODE006\Freq\RB3LYP\6-311G(d)\Br2\TYLERT\02-Feb-2009\0\\#N Ge
om=AllCheck Guess=Read SCRF=Check GenChk RB3LYP/6-311G(d) Freq\\Title\
\0,1\Br,0.,0.,-0.0263112705\Br,0.,0.,2.3073112705\\Version=AM64L-G03Re
vD.01\State=1-SGG\HF=-5148.2839416\RMSD=5.854e-11\RMSF=1.293e-06\Therm
al=0.0034749\Dipole=0.,0.,0.\DipoleDeriv=0.,0.,0.,0.,0.,0.,0.,0.,0.,0.
,0.,0.,0.,0.,0.,0.,0.,0.\Polar=17.7366557,0.,17.7366557,0.,0.,51.89093
66\PG=D*H [C*(Br1.Br1)]\NImag=0\\0.00021679,0.,0.00021679,0.,0.,0.1438
2273,-0.00021679,0.,0.,0.00021679,0.,-0.00021679,0.,0.,0.00021679,0.,0
.,-0.14382273,0.,0.,0.14382273\\0.,0.,0.00000224,0.,0.,-0.00000224\\\@

the only information that is needed out of this is HF=-5148.2839416. What is the best way to extract only this from the output file? This is further complicated by the fact that this does not always occur on one line but will sometimes appear as:
one one line: HF=-5148.28
39416 and then this part will be wrapped on to the next line.

Any help would be appreciated.

redalert013

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LEARN ABOUT OPENSOLARIS

break

break(1)							   User Commands							  break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

   ksh93
       +break [n]

       +continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,	then  break  n	levels.  If  n	is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this manual page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

	   1.	  Variable assignment lists preceding the command remain in effect when the command completes.

	   2.	  I/O redirections are processed after variable assignments.

	   3.	  Errors cause a script that contains them to abort.

	   4.	  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a
		  variable  assignment.  This  means  that tilde substitution is performed after the = sign, and also that word splitting and file
		  name generation are not performed.

   ksh93
       break is a shell special built-in that exits the smallest enclosing for, select, while, or until loop. It also exits the nth enclosing loop
       if n is specified. Execution continues at the command following the loop or loops.

       If n is specified, it must be a positive integer >=1. If n is larger than the number of enclosing loops, the last enclosing loop is exited.

       continue  is  a	shell special built-in that continues execution at the top of the smallest enclosing for, select, while, or until loop, if
       any; or of the top of the nth enclosing loop if n is specified.

       If n is specified, it must be a positive integer >=1. If n is larger than the number of enclosing loops, the last enclosing loop is used.

       On this manual page, ksh93(1) commands that are preceded by one or two + symbols are special built-in commands and are treated the  follow-
       ing ways:

	   1.	  Variable assignment lists preceding the command remain in effect when the command completes.

	   2.	  I/O redirections are processed after variable assignments.

	   3.	  Errors cause a script that contains them to abort.

	   4.	  Built-in commands are not valid function names.

	   5.	  Words  following  a command preceded by ++ that are in the format of a variable assignment are expanded with rules as a variable
		  assignment. This means that tilde substitution is performed after the = sign and field splitting and file  name  generation  are
		  not performed.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), ksh93(1), sh(1), attributes(5)

SunOS 5.11							    8 Apr 2008								  break(1)

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