hello people,
i am trying to accomplish what i thought should be a simple task: find a token in a file and delete a number (let's say 25) of lines following the token.
in sed, i can't figure out how to do a relative address (i.e. something like /token/25dd to delete 25 lines) and in gnu grep,... (3 Replies)
I am a beginner in Unix. Though have been asked to write a script to filter(remove duplicates) data from a .dat file. File is very huge containig billions of records.
contents of file looks like
30002157,40342424,OTC,mart_rec,100, ,0
30002157,40343369,OTC,mart_rec,95, ,0... (6 Replies)
Hello,
Although I have found similar questions, I could not find advice that
could help with our problem.
The issue:
We have several hundreds text files containing repeated blocks of text
(I guess back at the time they were prepared like that to optmize
printing).
The block of texts... (13 Replies)
My apologies if this has been answered in a previous post. I've been doing a lot of searching, but I haven't been able to find what I was looking for. Specifically, I am wondering if I can utilize sed and/or awk to locate two strings in a file, and replace everything between those two strings... (12 Replies)
Hello, guys!
"filename" has blocks with three lines each in this fashion:
93909286
#verified
has one bug
10909286
#unverified
pending
10909286
#unverified
pendingThe above example has duplicate blocks, and I have tried using sed to remove just one block... The... (2 Replies)
Hi,
I have a requirement in which i need to replace text as below -
<stringProp name="Recipe"><AddGroup Name="1001" Path="ServiceAdministration/Controls/1001/ServiceSwitches">
<Param Name="AttributeName" Value="HeaderManipRspIngressRuleSet" Type="String" />
<Param Name="Value"... (0 Replies)
Hi Folks,
I have a text file with lots of rows with duplicates in the first column, i want to filter out records based on filter columns in a different filter text file.
bash scripting is what i need.
Data.txt
Name OrderID Quantity
Sam 123 300
Jay 342 498
Kev 78 2500
Sam 420 50
Vic 10... (3 Replies)
Hello,
I have a script that is generating a tab delimited output file.
num Name PCA_A1 PCA_A2 PCA_A3
0 compound_00 -3.5054 -1.1207 -2.4372
1 compound_01 -2.2641 0.4287 -1.6120
3 compound_03 -1.3053 1.8495 ... (3 Replies)
I have csv file with 30, 40 columns
Pasting just three column for problem description
I want to filter record if column 1 matches CN or DN then,
check for values in column 2 if column contain 1235, 1235 then in column 3 values must be sequence of 2345, 2345
and if column 2 contains 6789, 6789... (5 Replies)
Hi Experts,
I have csv file with 30, 40 columns
Pasting just 2 column for problem description.
Need to print error if below combination is not present in file
check for column-1 (DocumentNumber) and filter columns where value in DocumentNumber field is same.
For all such rows, the field... (7 Replies)
Discussion started by: as7951
7 Replies
LEARN ABOUT REDHAT
getline
GETLINE(3) Linux Programmer's Manual GETLINE(3)NAME
getline, getdelim - delimited string input
SYNOPSIS
#define _GNU_SOURCE
#include <stdio.h>
ssize_t getline(char **lineptr, size_t *n, FILE *stream);
ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
DESCRIPTION
getline() reads an entire line, storing the address of the buffer containing the text into *lineptr. The buffer is null-terminated and
includes the newline character, if a newline delimiter was found.
If *lineptr is NULL, the getline() routine will allocate a buffer for containing the line, which must be freed by the user program. Alter-
natively, before calling getline(), *lineptr can contain a pointer to a malloc()-allocated buffer *n bytes in size. If the buffer is not
large enough to hold the line read in, getline() resizes the buffer to fit with realloc(), updating *lineptr and *n as necessary. In either
case, on a successful call, *lineptr and *n will be updated to reflect the buffer address and size respectively.
getdelim() works like getline(), except a line delimiter other than newline can be specified as the delimiter argument. As with getline(),
a delimiter character is not added if one was not present in the input before end of file was reached.
RETURN VALUE
On success, getline() and getdelim() return the number of characters read, including the delimiter character, but not including the termi-
nating null character. This value can be used to handle embedded null characters in the line read.
Both functions return -1 on failure to read a line (including end of file condition).
ERRORS
EINVAL Bad parameters (n or lineptr is NULL, or stream is not valid).
EXAMPLE
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE * fp;
char * line = NULL;
size_t len = 0;
ssize_t read;
fp = fopen("/etc/motd", "r");
if (fp == NULL)
exit(EXIT_FAILURE);
while ((read = getline(&line, &len, fp)) != -1) {
printf("Retrieved line of length %zu :
", read);
printf("%s", line);
}
if (line)
free(line);
return EXIT_SUCCESS;
}
CONFORMING TO
Both getline() and getdelim() are GNU extensions. They are available since libc 4.6.27.
SEE ALSO read(2), fopen(3), fread(3), gets(3), fgets(3), scanf(3)GNU 2001-10-07 GETLINE(3)