uniq remembers only 1 line -- the last one seen, therefore a file
will be
after running through uniq. It forgot that it saw 'one' already.
Before anyone starts complaining about how dumb uniq is, let me assure you that this is a feature -- it enables you to run the filter on a huge file that wouldn't fit in memory. Since sorting can be done fast (~ O(nlog(n))), it is usually run in a chain sort | uniq. If sorting messes you up and you absolutely have to preserve order, you could use awk to count the occurances, e.g.
I have a project where I have to use bzcat to uncompress a file and use that output as the data to run another program on.
I understand that you would do (bzcat filename.bz2 ! program name) but then how do you access that data in the c program??? Please help thanks (2 Replies)
Does anyone know how to answer this? I have tried many different commands, I just cant get it right.....
Search the file 'data' for all of the lines that contain the pattern 'unx122'
and put those lines in the file 'matches'. (2 Replies)
I've got a very ugly pipeline for analyzing web server logs (but nevermind the application; I've come across this in other scripts as well). I want to nicely comment the steps in the pipeline, but I can't seem to do it.
I know, for instance that in csh/sh/bash, a # begins a comment, and any... (2 Replies)
Hi,
I am trying to calculate a few values using the below code but it dosent seem to be working.
for i in 1 2 3 4 5 6 7 8
do
j=`expr $i + 3`
x =`head -$j temp1|tail -1|cut -f24 -d","`
y =`head -$j temp1|tail -1|cut -f25 -d","`
c =`expr $x / $y`
echo "$c" >> cal_1
done
I am not... (4 Replies)
I need to read input from a file, and make sure nothing prints after column 72.
basically, ignore input after character 72 until the next newline character.
Any help is appreciated. I have been searching forever! (10 Replies)
Hello All,
I need to convert a csv file to pipeline delimiter file in UNIX. The data in file itself contains comma with double qouted qualifier apart from the comma separator. Let me know how to do it. Appreciate any help if awk can be used to do it.
Mentioned below is the sample record of... (14 Replies)
Hi
Can anybody please explain me the following script in detail
Value=`echo "if ( ${FACTOR} >= 1 ) {1}" | bc`
What does "{1}" mean to here ? (3 Replies)
Hello,
I am attempting to ssh to a server and run a set of commands on a remote set of servers. I am getting the following error below, I am thinking quotes may be the problem. This command works on the local machine in bash. Not when I ssh to a remote server. Basically the command should... (3 Replies)
hi this is a homework assignment i need some help with
it mostly works.
script file
#!/usr/bin/env bash
#create dictionary file
grep -E '.{3}' /usr/share/dict/british-english > db.txt
#create remove_word to test file
touch removeW.txt
#palindrome function
palin()
{
... (1 Reply)