Hello!
Im trying to read file contents. Then, print out every line that has "/bens/here" in the file that was read.
cat /my/file.now | sed '/bens/here/p'
I keep getting the error asking if I need to predeclare sed?
What does predeclaring sed mean?
Thanks!
Ben (2 Replies)
Hi guys.
I need a sed command to print like 10 lines after a regular expression is found in the log.
Can anyone help me out.
Thanks
---------- Post updated at 10:52 AM ---------- Previous update was at 10:34 AM ----------
never mind.
I just did the search bewteen two expressions. (1 Reply)
Hi all,
This should be very easy but I can't figure it out...
I have a file that looks like this:
@SRR057408.1 FW8Y5CK02R652T length=34
AGCAGTGGTATCAACGCAGAGTAAGCAGTGGTAT
+SRR057408.1 FW8Y5CK02R652T length=34
FIIHFF6666?=:88@@@BBD:::?@ABBAAA>8
@SRR057408.2 FW8Y5CK02TBMHV length=52... (1 Reply)
I have a very large results file, and a list of filters
grep -wf filterlist.txt datafile.txt > outfile.txt
The above line works but is very slow and I'm wondering how to make it faster.
The items in my filterlist are only relevant to the first column. I don't care if any item in the... (1 Reply)
I am trying to print those line which has no # in the begining of the line.
The sed I used for this purpose as shown below is not giving the required output.
echo 'PDE 5600' | sed -n 's/^\!#/&/p'
Where lies the problem:confused: (3 Replies)
HI All,
I am using grep command to serach a pattern in a list of files and storing the output in a variable. Then i am applying some logic on that variable to get the required output.
But Thing is that when the pattern is present mutiple times in a file, i am getting the output of grep in a... (3 Replies)
I am trying to extract a table of data (mysql query output) from a log file. I need to print everything below the header and not past the end of the table. I have spent many hours searching with little progress. I am matching the regexp +-\{99\} with no problem. I just can't figure out how to print... (5 Replies)
Discussion started by: godfreydanials
5 Replies
LEARN ABOUT DEBIAN
plan9-tail
TAIL(1) General Commands Manual TAIL(1)NAME
tail - deliver the last part of a file
SYNOPSIS
tail [ +-number[lbc][rf] ] [ file ]
tail [ -fr ] [ -n nlines ] [ -c nbytes ] [ file ]
DESCRIPTION
Tail copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is copied.
Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K
blocks or bytes, according to the appended flag or Default is -10l (ten ell).
The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to
keep watch and print further data as it appears.
The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed.
EXAMPLES
tail file
Print the last 10 lines of a file.
tail +0f file
Print a file, and continue to watch data accumulate as it grows.
sed 10q file
Print the first 10 lines of a file.
SOURCE
/src/cmd/tail.c
BUGS
Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length.
According to custom, option +number counts lines from 1, and counts blocks and bytes from 0.
Tail is ignorant of UTF.
TAIL(1)