Read from a pipe or die in perl Post: 302416763

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

read after pipe problem OSX10.4

I use read often in scripts to filter the right part into a variable like: $ print "abc cde efg" | read k l ; print "k=$k, l=$l" k=, l= This works on linux and unix versions I work with. On OSX 10.4 this doesn't work. I found a workaround but would like to know why the original line...

2. Programming

Problem in read() from a pipe

Hi, Can any one please help me with this. Am struggling hard to get a solution. I am doing telnet through a C program and getting the stdout file descriptor of the remote machine to pipe. read() function is getting data, But whenl it receives SOH character ie. ^A ( Start of heading = Console...

3. Programming

pipe read and write with many forked children

I know how to read and write if i have a forked process with only one child. However what is involved with reading and writing with many forked processes. Say one parent that forks 5 children, and needs to communicate with all 5 in half duplex. int temp, counter=0; do{ pipe(temp); ...

4. Shell Programming and Scripting

perl problem - why isn't 'die' being called?

last week i started learning perl, so have limited skill and knowledge. why isn't 'die' being called and the script exiting before the 'directory created' line? if (! -d "$logdir") { system "mkdir -p $logdir" || die print "\nERROR: release log directory creation failed - $logdir: $!\n";...

5. Shell Programming and Scripting

perl problem - another 'die' issue.

two things. why doesn't the 'die' message get displayed - "Error: release log directory creation failed..."? why does the script name and line number get displayed despite the inclusion of a '\n'. apparently adding a newline prevents this from happening. if (! -d "$logdir") { use...

6. Shell Programming and Scripting

[SOLVED] nawk FS using pipe read variables from file

7. Shell Programming and Scripting

Read pipe data

Hello, I need to read the pipe data as:- cat abc.txt | uuencode abc.txt | mailx -s hi xyz@xyz.com I will override the mailx function so that when mailx is called, it calls my version of maix and in that function I want to read the file which is attached in progional mailx function- abc.txt...

8. Shell Programming and Scripting

While read pipe input issue

Hello, I have an ffmpeg bash script which is working nice and I need to do the same for other sources. To create new scripts and to deal with multiple bash files sounds not logical. It is a bit hard to manage for me.. I wondered if it was possible to make my input file as variable. Then I...

9. Shell Programming and Scripting

UNIX fifo concurrent read from a named pipe

I have created a fifo named pipe in solaris, which writes the content of a file, line by line, into pipe as below: $ mkfifo namepipe $ cat books.txt "how to write unix code" "how to write oracle code" $ cat books.txt >> namepipe & I have a readpipe.sh script which reads the named...

10. UNIX for Beginners Questions & Answers

UNIX Pipe -Exit when there are no bytes to read

Hi All, I'm creating a program which reads millions of bytes from the PIPE and do some processing. As the data is more, the idea is to read the pipe parallely. Sun Solaris 8 See the code below: #!/bin/sh MAXTHREAD=30 awk '{print $1}' metadata.csv > nvpipe & while do ...

LEARN ABOUT OPENDARWIN

script

SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-a] [-k] [-q] [-t time] [file [command ...]]

DESCRIPTION

     The script utility makes a typescript of everything printed on your terminal.  It is useful for students who need a hardcopy record of an
     interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).

     If the argument file is given, script saves all dialogue in file.	If no file name is given, the typescript is saved in the file typescript.

     If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell.

     Options:

     -a       Append the output to file or typescript, retaining the prior contents.

     -k       Log keys sent to program as well as output.

     -q       Run in quiet mode, omit the start and stop status messages.

     -t time  Specify time interval between flushing script output file.  A value of 0 causes script to flush for every character I/O event.  The
	      default interval is 30 seconds.

     The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if
     ignoreeof is not set) for the C-shell, csh(1)).

     Certain interactive commands, such as vi(1), create garbage in the typescript file.  The script utility works best with commands that do not
     manipulate the screen.  The results are meant to emulate a hardcopy terminal, not an addressable one.

ENVIRONMENT

     The following environment variable is utilized by script:

     SHELL  If the variable SHELL exists, the shell forked by script will be that shell.  If SHELL is not set, the Bourne shell is assumed.  (Most
	    shells set this variable automatically).

SEE ALSO

     csh(1) (for the history mechanism).

HISTORY

     The script command appeared in 3.0BSD.

BUGS

     The script utility places everything in the log file, including linefeeds and backspaces.	This is not what the naive user expects.

     It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues.

     When running in -k mode, echo cancelling is far from ideal.  The slave terminal mode is checked for ECHO mode to check when to avoid manual
     echo logging.  This does not work when in a raw mode where the program being run is doing manual echo.

BSD
								   June 6, 1993 							       BSD