print lines AFTER lines cointaining a regexp (or print every first and fourth line)
Hi all,
This should be very easy but I can't figure it out...
I have a file that looks like this:
I want to print every first and fourth line so that the output looks like this:
No matter what I try along the lines of
, I can't get it to work. I'm sure there is an easy to specify the printing of every first and fourth line only but for future reference, how would I specify "print lines after lines beginning with a plus sign?"
Thanks,
Kevin
---------- Post updated at 08:34 PM ---------- Previous update was at 08:14 PM ----------
Good Day,
Im new to scripting especially awk and sed. I just would like to ask help from you guys about a sed command that prints the line immediately after a regexp, but not the line containing the regexp.
sed -n '/regexp/{n;p;}' filename
What if my regexp is 3 word or a sentence. Im... (3 Replies)
Hello
I have a silly question. I need to grep a match in text file
and then print 5 lines after it.
grep -A 5 .... do it.
OK
The next thing I can not handle is I need each output to be on 1 line
match line2 line3 line4 line5
match line2 line3 line4 line5
etc..
I will really... (10 Replies)
I am on a Solaris 10 x86 system
sample code
before3
before2
before1
group
after1
after2
after3
I want to grab the second line above my regexp
regexp=group
I want to grab ONLY the before2 line
I have numerous sed and awk ways of grabbing X line below the regexp, but no luck... (1 Reply)
Hi,
Anyone help me to print the lines from the flat file between 879th line number and 1424th line number.
The 879 and 1424 should be passed as input to the shell script(It should be dynamic).
Can any one give me using sed or awk?
I tried using read, and print the lines..Its taking too... (3 Replies)
Hi,
I have a file, say files_list, as below (o/p of ls -R cmd)
$ cat files_list
/remote/dir/path/to/file:
sub-dir1
sub-dir2
sub-dir3
...
/remote/dir/path/to/file/sub-dir1:
remote_file1.csv.tgz
<blank line 1>
/remote/dir/path/to/file/sub-dir2:
remote_file2.csv.tgz
<blank... (3 Replies)
Hi All
I'm trying to extract the line just above a regexp and all lines after this.
I'm currently doing this in two steps
sed -n -e "/^+---/{g;p;}" -e h oldfile.txt > modified.txt
sed -e "1,/^+---/d" -e "/^$/d" oldfile.txt >>modified.txt
Sample
sometext will be here
sometext will be... (3 Replies)
Hi all,
i need help to extract each first line from multiple lines occurrences based on different patterns (name) starting from the fourth lines like follows:-
// header 1 header 2 header 3
// no acc name score rank
//... (2 Replies)
Hi All,
I have a file looks like:
rst:singh:99.0.20-X86 2 rst:ACSI_SIN_SERVICES
rst:singh:99.0.20-X86 2 rst:ACSI_BISI want to wrap 3rd col in one line and add variable value at start and ending of line and I wrote command:
cat file | awk '{print $3}' | xargs > command.txt
sed -e... (1 Reply)
I have a directory of files, I can show the number of lines in each file and order them from lowest to highest with:
wc -l *|sort
15263 Image.txt
16401 reference.txt
40459 richtexteditor.txt
How can I also print the number of unique lines in each file?
15263 1401 Image.txt
16401... (15 Replies)
Discussion started by: spacegoose
15 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)