[SOLVED] Strange Error executing the script.

David the H. · 04-26-2012, 11:07 AM

Try adding the carriage return to awk's record separator to tell it to handle both kinds of line-ending.

Code:

awk -v RS='(\r\n|\n)' '...<expression>...'

Another hint: to check the output of a command for non-printing characters, pipe it through "cat -A". Any hidden stuff will show up as a caret-prefixed letter, with "^M" being the one for carriage return.

pinga123 · 04-27-2012, 12:02 AM

Quote:

Originally Posted by David the H.

Try adding the carriage return to awk's record separator to tell it to handle both kinds of line-ending.

Code:

awk -v RS='(\r\n|\n)' '...<expression>...'

Another hint: to check the output of a command for non-printing characters, pipe it through "cat -A". Any hidden stuff will show up as a caret-prefixed letter, with "^M" being the one for carriage return.

Sir you are right.
Here's what i did.

Code:

$ sh test.sh > sample.txt
")syntax error: invalid arithmetic operator (error token is "
$ cat -a sample.txt
cat: invalid option -- a
Try `cat --help' for more information.
$ cat -A sample.txt
1013^M$

I think $ is a hidden.

Here's the modified code. Thanks it worked.

Code:

getInfo()
{
Total_Memory=$(ssh -t -tq  fmgadmin@$1 "sudo /usr/sbin/xm info"  |awk -v RS='(\r\n|\n)' ' /total_mem/ {print $3}')
echo "$Total_Memory"
Count=$((Total_Memory + 1))
echo "$Count"
}
getInfo 10.180.45.13

grail · 04-27-2012, 01:21 AM

If you make the same adjustments to pan64's solution, you can, as he said, do away with all the extra assigning and echoes.

David the H. · 04-27-2012, 05:53 AM

The dollar sign is just the unix newline character.

Unix line ending format = the ascii line feed (LF, octal 012) character. Also called "newline". cat displays it as "$", and shell notation is "\n".

DOS line ending format = ascii carriage return plus line feed (CR+LF, octal 015+012). cat displays the CR with the caret notation "^M", and the shell notation is "\r"

So when your input has dos style line-endings, tools like sed and awk see (and remove) only the LF as the line delimiter, and the CR gets left behind at the end of the line, unseen but capable of causing all kinds of errors.

BTW, old style apple systems used to use CR only as the newline. But since OSX is unix-based, they now use LF too.

BTW2, caret notation is explained here, http://en.wikipedia.org/wiki/Caret_notation, (and see man ascii for reference). In a nutshell, add 100 to the non-printing character's octal value to get the character used to display it.

pinga123 · 04-29-2012, 11:42 PM

Quote:

Originally Posted by David the H.

The dollar sign is just the unix newline character.

Unix line ending format = the ascii line feed (LF, octal 012) character. Also called "newline". cat displays it as "$", and shell notation is "\n".

DOS line ending format = ascii carriage return plus line feed (CR+LF, octal 015+012). cat displays the CR with the caret notation "^M", and the shell notation is "\r"

So when your input has dos style line-endings, tools like sed and awk see (and remove) only the LF as the line delimiter, and the CR gets left behind at the end of the line, unseen but capable of causing all kinds of errors.

BTW, old style apple systems used to use CR only as the newline. But since OSX is unix-based, they now use LF too.

BTW2, caret notation is explained here, http://en.wikipedia.org/wiki/Caret_notation, (and see man ascii for reference). In a nutshell, add 100 to the non-printing character's octal value to get the character used to display it.

That was very informative thanks.