Sponsored Content
Full Discussion: echo with stdin
Top Forums Shell Programming and Scripting echo with stdin Post 302090996 by Corona688 on Thursday 28th of September 2006 11:00:59 AM
Old 09-28-2006
That is not what echo does. echo prints the commandline arguments it is given, not stdin, not any other file, period. xargs is a workaround that translates things read from stdin into commandline arguments for it, an extra program to join them together. You can limit the number of commands xargs gives to a command like
Code:
xargs --max-args=1 echo < file

But, again, why not just use cat? That's what it's there for.
 

10 More Discussions You Might Find Interesting

1. Programming

stdin

hi, how does a program know whether some data are available from stdin? I would like to make a program which could read its data from stdin and _if_there_is_nothing_at_stdin_ from a file which name is given as an argument. If there is nothing in stdin and no filename is given as argument,... (2 Replies)
Discussion started by: marquis
2 Replies

2. Shell Programming and Scripting

redirect STDIN

can you redirect STDIN with command arguments? I have tried this approach: # ./script -option <argument1> <argument2> 0<$2 # $2: ambiguous redirect Is this possible? (4 Replies)
Discussion started by: prkfriryce
4 Replies

3. Shell Programming and Scripting

Capturing stdin

Hi all, Consider the following situation: - you launch an compiled binary application from inside a unix shell which presents a text-based type user interface where you can input information ... # echo "I am the $SHELL shell" # I am the /bin/bash shell # ./input # ... imagine the binary... (3 Replies)
Discussion started by: domivv
3 Replies

4. Shell Programming and Scripting

Redirecting to stdin

Hi, I'm having trouble with my script. I have to select different choices without any interaction from a menu that looks like : a - xxxxxxxxxxxxxx b - xxxxxxxxxxxxxx c - xxxxxxxxxxxxxx d - xxxxxxxxxxxxxx I tried things like : echo "a" >&0 read < echo "a" but none worked. Any... (4 Replies)
Discussion started by: flame_eagle
4 Replies

5. Programming

How to write to stdin of another program (program A -> [stdin]program B)

Hi, Program A: uses pipe() I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using: * child -> dup2(fd, STDOUT_FILENO); -> execl("/path/PROGRAM B", "PROGRAM B", NULL); * parent -> char line; -> read(fd, line, 100); Question: ---------... (1 Reply)
Discussion started by: vvaidyan
1 Replies

6. UNIX for Dummies Questions & Answers

How to write to stdin of another program (program A -> [stdin]program B)

Hi, Program A: uses pipe() I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using: * child -> dup2(fd, STDOUT_FILENO); -> execl("/path/PROGRAM B", "PROGRAM B", NULL); * parent -> char line; -> read(fd, line, 100); Question: ---------... (3 Replies)
Discussion started by: vvaidyan
3 Replies

7. UNIX for Dummies Questions & Answers

fork and stdin

When a process fork(), the child share the same file descriptors as his father. Thus, they share the same stdin. Quick and dirty exemple below (sorry for the ugly gets() call) : #include <stdio.h> #include <unistd.h> int main() { char buf; if (fork()) { /*parent */ ... (1 Reply)
Discussion started by: milouz
1 Replies

8. UNIX for Dummies Questions & Answers

How to correctly use an echo inside an echo?

Bit of a weird one i suppose, i want to use an echo inside an echo... For example... i have a script that i want to use to take users input and create another script. Inside this script it creates it also needs to use echos... echo "echo "hello"" >$file echo "echo "goodbye"" >$file ... (3 Replies)
Discussion started by: mokachoka
3 Replies

9. Shell Programming and Scripting

STDIN-perl

Good morning! How do I make the info that someone inputs from @userArray = <STDIN>, a new array? @userArray = <STDIN>; while () { chomp; last if ! /\d/; push(@userArray,$_); } my($sum,$avg) = &sumIt(@userArray); print "Total:$sum\nAverage:$avg\n"; Im... (2 Replies)
Discussion started by: bigben1220
2 Replies

10. UNIX for Dummies Questions & Answers

STDIN and STDOUT

Hallo, i have a script like: if ;then echo "OK" else echo "ERROR $2 is missing" fi; if ;then touch $2 fi; if ;then cat $1 | grep xy > $2 (1 Reply)
Discussion started by: eightball
1 Replies
STREAM_COPY_TO_STREAM(3)						 1						  STREAM_COPY_TO_STREAM(3)

stream_copy_to_stream - Copies data from one stream to another

SYNOPSIS
int stream_copy_to_stream (resource $source, resource $dest, [int $maxlength = -1], [int $offset]) DESCRIPTION
Makes a copy of up to $maxlength bytes of data from the current position (or from the $offset position, if specified) in $source to $dest. If $maxlength is not specified, all remaining content in $source will be copied. PARAMETERS
o $source - The source stream o $dest - The destination stream o $maxlength - Maximum bytes to copy o $offset - The offset where to start to copy data RETURN VALUES
Returns the total count of bytes copied. CHANGELOG
+--------+------------------------------+ |Version | | | | | | | Description | | | | +--------+------------------------------+ | 5.1.0 | | | | | | | Added the $offset parameter | | | | +--------+------------------------------+ EXAMPLES
Example #1 A stream_copy_to_stream(3) example <?php $src = fopen('http://www.example.com', 'r'); $dest1 = fopen('first1k.txt', 'w'); $dest2 = fopen('remainder.txt', 'w'); echo stream_copy_to_stream($src, $dest1, 1024) . " bytes copied to first1k.txt "; echo stream_copy_to_stream($src, $dest2) . " bytes copied to remainder.txt "; ?> SEE ALSO
copy(3). PHP Documentation Group STREAM_COPY_TO_STREAM(3)
All times are GMT -4. The time now is 02:12 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy