06-18-2009
Using GREP for special characters
Hi folks
I am issuing the following command:
grep "[\/:*?"<>|#+%&]" *
Looking for the characters \/:*?"<>|#+%& within all files in a directory, but the command fails being unhappy with pipe:
ksh: 0403-057 Syntax error: `|' is not expected.
How do I force the command to take the pipe | ? I guess the same is for *some* of the other symbols.
Regards, Dave
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I need to sort a file, the sort is not a alphabetical sort, it's based on a predefined order which is read from a file called fSortOrder.
The format of the fSortOrder file is :
STARTPATH"
....
....
The file that needs to be sorted is called tmpUnsorted and contains data in the format : ... (6 Replies)
Discussion started by: Vashj
6 Replies
2. UNIX Desktop Questions & Answers
Hi there
I need to grep for a detail from a file. The pattern to search for involves escape sequences in it. This causes for the problem.
grep "P\_SOME\_STRING\_SEARCH" filename
Note, I have line like below in the file and expect it to grep.
select *
from my_system_param
... (3 Replies)
Discussion started by: guruparan18
3 Replies
3. Shell Programming and Scripting
I have a file that I am processing with a while loop from, in come cases the grep/sed command (strings record | grep “errorDetail” | sed 's&*errorDetail\(.*)\(/errorDetail\).*&\1&') works and produces the data I am after and in some it does not. I have inspected the data within the failing... (3 Replies)
Discussion started by: gugs
3 Replies
4. UNIX for Dummies Questions & Answers
Hello,
i have a file called test
hello1
"how" are you4
good"bye"
good7bye
i am trying to print all lines from test that either end with a digit or contain a double quote character anywhere on the line.
i did
grep -n '$' test and was able to print lines ending with digits.
i also did... (2 Replies)
Discussion started by: hobiwhenuknowme
2 Replies
5. Shell Programming and Scripting
I'm looking for SED equivalent for grep -w -f. All I want is to search a list of patterns from a file. Also If the pattern doesn't match I do not want "null returned", rather I would prefer some text as place holder say "BLANK LINE" as I intend to process the output file based on line number.
... (1 Reply)
Discussion started by: novice_man
1 Replies
6. UNIX for Advanced & Expert Users
Hey guys,
I have a file with an ID which I'm using to grep out the original record from another file. Problem is I have special characters in the original file, and grep is returning only a partial record. How can I get around this?
Appreciate your help!
Pete (3 Replies)
Discussion started by: peteroc
3 Replies
7. Shell Programming and Scripting
Need Help For GREP
I have a file say g1.txt and content of file is below
REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoDrives /t REG_DWORD /d 4 /f ,
REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoClose /t REG_DWORD /d 1 /f ,... (4 Replies)
Discussion started by: jalpasoni
4 Replies
8. Shell Programming and Scripting
Is there any command or shell script to grep any special character from a file ? I have a huge file containing millions of user names; the requirement is to find names containing special characters.
#!/bin/bash
for i in `cat username.txt`
do
#COMMAND to grep special character
done
... (3 Replies)
Discussion started by: poga
3 Replies
9. Shell Programming and Scripting
Hi,
I have a file which has numerous lines and some of the lines having special characters in it. i want to grep the lines which are having special characters.
say,
one line looks like - %*()$#@"", | acbd
antoher line looks like ***##^%! | efcg
so these kind of lines are present... (5 Replies)
Discussion started by: rbalaj16
5 Replies
10. Shell Programming and Scripting
If I have a file like the following
abc.1
abc
abc_1
abc..1
abc*1
abc@1
abc def ghr
def......
ddef 5466 def ed
def** 123445
I`m trying to find exact words from the list
abc
def (4 Replies)
Discussion started by: ritakadm
4 Replies
PIPE(2) BSD System Calls Manual PIPE(2)
NAME
pipe -- create descriptor pair for interprocess communication
SYNOPSIS
#include <unistd.h>
int
pipe(int fildes[2]);
DESCRIPTION
The pipe() function creates a pipe (an object that allows unidirectional data flow) and allocates a pair of file descriptors. The first
descriptor connects to the read end of the pipe; the second connects to the write end.
Data written to fildes[1] appears on (i.e., can be read from) fildes[0]. This allows the output of one program to be sent to another pro-
gram: the source's standard output is set up to be the write end of the pipe; the sink's standard input is set up to be the read end of the
pipe. The pipe itself persists until all of its associated descriptors are closed.
A pipe whose read or write end has been closed is considered widowed. Writing on such a pipe causes the writing process to receive a SIGPIPE
signal. Widowing a pipe is the only way to deliver end-of-file to a reader: after the reader consumes any buffered data, reading a widowed
pipe returns a zero count.
The generation of the SIGPIPE signal can be suppressed using the F_SETNOSIGPIPE fcntl command.
RETURN VALUES
On successful creation of the pipe, zero is returned. Otherwise, a value of -1 is returned and the variable errno set to indicate the error.
ERRORS
The pipe() call will fail if:
[EFAULT] The fildes buffer is in an invalid area of the process's address space.
[EMFILE] Too many descriptors are active.
[ENFILE] The system file table is full.
SEE ALSO
sh(1), fork(2), read(2), socketpair(2), fcntl(2), write(2)
HISTORY
A pipe() function call appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution February 17, 2011 4th Berkeley Distribution