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Full Discussion: Help on simple shell script
Top Forums Shell Programming and Scripting Help on simple shell script Post 302997070 by dcaccount on Sunday 7th of May 2017 11:05:01 AM
Old 05-07-2017
Help on simple shell script

Hello,

I need to create one very simple shell script that checks if the first character of the file ./pump.txt is 0 and in that case gives a message.
If the first character is instead 1, it does give a different message.

I have written:
Code:
irr= head -c 1  ./pump.txt
if [[ "$irr" == "0" ]]; then
        echo "!!!!!!!!!! Disabled"
else
        echo "Enabled"
fi

It does not work.


Ps, the file ./pump.txt is generated by the following commands:
Code:
echo "1" > "./pump.txt"
echo "0" > "./pump.txt"

Can you please help me?
Thanks,
daniele

Last edited by DukeNuke2; 05-07-2017 at 04:42 PM..
 

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FPRINTF(3)								 1								FPRINTF(3)

fprintf - Write a formatted string to a stream

SYNOPSIS
int fprintf (resource $handle, string $format, [mixed $args], [mixed $...]) DESCRIPTION
Write a string produced according to $format to the stream resource specified by $handle. PARAMETERS
o $handle -A file system pointer resource that is typically created using fopen(3). o $format - See sprintf(3) for a description of $format. o $args - o $... - RETURN VALUES
Returns the length of the string written. EXAMPLES
Example #1 fprintf(3): zero-padded integers <?php if (!($fp = fopen('date.txt', 'w'))) { return; } fprintf($fp, "%04d-%02d-%02d", $year, $month, $day); // will write the formatted ISO date to date.txt ?> Example #2 fprintf(3): formatting currency <?php if (!($fp = fopen('currency.txt', 'w'))) { return; } $money1 = 68.75; $money2 = 54.35; $money = $money1 + $money2; // echo $money will output "123.1"; $len = fprintf($fp, '%01.2f', $money); // will write "123.10" to currency.txt echo "wrote $len bytes to currency.txt"; // use the return value of fprintf to determine how many bytes we wrote ?> SEE ALSO
printf(3), sprintf(3), sscanf(3), fscanf(3), vsprintf(3), number_format(3). PHP Documentation Group FPRINTF(3)
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