Deference between pipe and normal file

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to grep a line not starting with # from a file (there are two lines starting with # and normal)?

e.g. File name: File.txt cat File.txt Result: #INBOUND_QUEUE=FAQ1 INBOUND_QUEUE=FAQ2 I want to get the value for one which is not commented out. Thanks,

2. Solaris

NFS - concurrent write to same file normal ?

Hi all, Sorry if I sound like a novice , I have always thought that for network file system which can be shared, there will be some access restriction in which when user A is writing/editing fileA, user B is able to view the same fileA but cannot write/edit it until user A has...

3. Shell Programming and Scripting

How to cut a pipe delimited file and paste it with another file to form a comma separated outputfile

Hello ppl I have a requirement to split (cut in unix) a file (A.txt) which is a pipe delimited file into A1.txt and A2.txt Now I have to join (paste in unix) this A2.txt with external file A3.txt to form output file A4.txt which should be CSV (comma separated file) so that third party can...

4. Shell Programming and Scripting

How to ignore Pipe in Pipe delimited file?

Hi guys, I need to know how i can ignore Pipe '|' if Pipe is coming as a column in Pipe delimited file for eg: file 1: xx|yy|"xyz|zzz"|zzz|12... using below awk command awk 'BEGIN {FS=OFS="|" } print $3 i would get xyz But i want as : xyz|zzz to consider as whole column...

5. Shell Programming and Scripting

csv file comparison with normal file

i will like to give my files as fileB : 02.09.2011:MOU04/KUBIS--R_Lieferung_1/KUBIS_V15.0/vpn_wls_15-0-0b01 02.09.2011:MOU04/KUBIS--R_Lieferung_2/KUBIS_V15.0/apng_wls_15-0-0b02 31 02.09.2011:MOU04/KUBIS--R_Lieferung_2/KUBIS_V15.0/ecc_wls_15-0-0b02 32 ...

6. UNIX for Dummies Questions & Answers

Pipe binary file matches grep results to file

I am using grep to match a pattern, but the output is strange. $ grep -r -o "pattern" * Gives me: Binary file foo1 matches Binary file foo2 matches Binary file foo3 matches To find the lines before/after, I then have to use the following on each file: $ strings foo1 | grep -A1 -B1...

7. UNIX for Dummies Questions & Answers

Determines a file is a NORMAL text file

I assign the variable name=`find . -type f | awk -vR=$num '{if (NR == R) {print; exit}}` which returns the name of a file in "$num" ordered in the folder to the variable $name. I want to use IF and determine if the file is a NORMAL text file (does not contain an extension), the command will...

8. UNIX for Dummies Questions & Answers

[URGENT] Determines a file is a NORMAL text file

9. Shell Programming and Scripting

Convert CSV file (with double quoted strings) to pipe delimited file

Hi, could some help me convert CSV file (with double quoted strings) to pipe delimited file: here you go with the same data: 1,Friends,"$3.99 per 1,000 listings",8158here " 1,000 listings " should be a single field. Thanks, Ram

10. Shell Programming and Scripting

identify files with "Normal termination" and compress them into a .tar.gz file

Hi, I have hundreds of files "*.out" located in one folder, and I want to: 1. Identify the good files containing "Normal termination" (grep "Normal termination" *.out ) 2. Compress the good files into a tar.gz file (tar cvfz good.tar.gz *.goog.out ) Is there a way I can automate this...

LEARN ABOUT V7

pipe

PIPE(2) 							System Calls Manual							   PIPE(2)

NAME

       pipe - create an interprocess channel

SYNOPSIS

       pipe(fildes)
       int fildes[2];

DESCRIPTION

       The pipe system call creates an I/O mechanism called a pipe.  The file descriptors returned can be used in read and write operations.  When
       the pipe is written using the descriptor fildes[1] up to 4096 bytes of data are buffered before the writing process is suspended.   A  read
       using  the  descriptor  fildes[0] will pick up the data.  Writes with a count of 4096 bytes or less are atomic; no other process can inter-
       sperse data.

       It is assumed that after the pipe has been set up, two (or more) cooperating processes (created by subsequent fork calls)  will	pass  data
       through the pipe with read and write calls.

       The Shell has a syntax to set up a linear array of processes connected by pipes.

       Read calls on an empty pipe (no buffered data) with only one end (all write file descriptors closed) returns an end-of-file.

SEE ALSO

       sh(1), read(2), write(2), fork(2)

DIAGNOSTICS

       The  function value zero is returned if the pipe was created; -1 if too many files are already open.  A signal is generated if a write on a
       pipe with only one end is attempted.

BUGS

       Should more than 4096 bytes be necessary in any pipe among a loop of processes, deadlock will occur.

ASSEMBLER

       (pipe = 42.)
       sys pipe
       (read file descriptor in r0)
       (write file descriptor in r1)

																	   PIPE(2)

Linux