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Full Discussion: Help with shell script errors
Top Forums Shell Programming and Scripting Help with shell script errors Post 302398345 by surubi_abada on Wednesday 24th of February 2010 10:04:53 AM
Old 02-24-2010
Help with shell script errors
hey watsup guys

i am new in the shell script world. so i need help fom you guys, i have written these two codes and they both give the same errors( expr : syntax error).

Code 1 :

Code:
#! /bin/sh
# count1 appends an increment to a file 200 times
# note that a file called numbers must be initialised to contain 0

count=0
while [ $count -lt 200 ] # loop 200 times 
do
count=`expr $count + 1` # increment counter
n=`tail -1 numbers` # get last line from numbers file
expr $n + 1 >> numbers # add 1 to it and append it back
done

Code 2:

Code:
#! /bin/sh
# count2 also increments and appends a value to the numbers file
# but only when it can successfully create a new hard link to the numbers file

count=0
while [ $count -lt 200 ] # still loop 200 times
do
count=`expr $count + 1` # increment the loop counter
if ln numbers numbers.lock # try to enter the critical region
then # in this case, ln is similar to TSL
n=`tail -1 numbers` # get the last number to increment
expr $n + 1 >> numbers # increment it and append it to the file
rm numbers.lock # exit the critical region
fi # Note that if the ln was unsuccessful, we don't
# do busy waiting, but just continue looping
done

These syntax errors are killing me. i would apreciate if someone could help as soon as possible

Much love
Last edited by pludi; 02-24-2010 at 01:00 PM.. Reason: code tags, please...
 

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viewperl

VIEWPERL(1)							   User Commands						       VIEWPERL(1)

NAME

       viewperl - quickly view syntax highlighted Perl code

SYNOPSIS

       viewperl [OPTION]... FILE...

DESCRIPTION

       View a Perl source code file, syntax highlighted.

       -c, --code=CODE
	      view CODE, syntax highlighted

       -l, --lines
	      display line numbers

       -L, --no-lines
	      supress display of line numbers (default)

       -m, --module=FILE
	      consider FILE the name of a module, not a file name

       -n, --name
	      display the name of each file (default)

       -N, --no-name
	      supress display of file names (implied by --no-reset)

       -p, --pod
	      display inline POD documentation (default)

       -P, --no-pod
	      hide POD documentation (line numbers still increment)

       -r, --reset
	      reset formatting and line numbers each file (default)

       -R, --no-reset
	      supress resetting of formatting and line numbers

       -s, --shift=WIDTH
	      set tab width (default is 4)

       -t, --tabs
	      translate tabs into spaces (default)

       -T, --no-tabs
	      supress translating of tabs into spaces

       --help display this help and exit

       Note that module names should be given as they would appear after a Perl `use' or `require' statement.  `Getopt::Long', for example.

       Each string given using -c is considered a different file, so line number and formatting resets will apply.

       View a Perl source code file, syntax highlighted.

       -c, --code=CODE
	      view CODE, syntax highlighted

       -l, --lines
	      display line numbers

       -L, --no-lines
	      supress display of line numbers (default)

       -m, --module=FILE
	      consider FILE the name of a module, not a file name

       -n, --name
	      display the name of each file (default)

       -N, --no-name
	      supress display of file names (implied by --no-reset)

       -p, --pod
	      display inline POD documentation (default)

       -P, --no-pod
	      hide POD documentation (line numbers still increment)

       -r, --reset
	      reset formatting and line numbers each file (default)

       -R, --no-reset
	      supress resetting of formatting and line numbers

       -s, --shift=WIDTH
	      set tab width (default is 4)

       -t, --tabs
	      translate tabs into spaces (default)

       -T, --no-tabs
	      supress translating of tabs into spaces

       --help display this help and exit

       Note that module names should be given as they would appear after a Perl `use' or `require' statement.  `Getopt::Long', for example.

       Each string given using -c is considered a different file, so line number and formatting resets will apply.

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