Questions tagged [cat]
The cat tag has no usage guidance.
30
questions
0
votes
1
answer
61
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show content of file and sort the content output
very simple question (i'm guessing.)
i use cat <filename.txt> | grep "word:" | awk '{print $2}'
and get the desired info like so
[user@server ~]# cat <filename.txt> | grep "...
2
votes
1
answer
254
views
Cygwin 2.9.0 cat/tac Commands Fail on Large Files when Piping to grep -q -m1
I am seeing some odd behavior using Cygwin x64 2.9.0 on Windows 10 Pro x64. The command I am attempting to run is the following:
tac <file> | grep -q -m1 -F "literal string"
The above command ...
1
vote
2
answers
211
views
Concatenating text files to a virtual file(or a program) on Linux
For example, I have four pieces (1.txt, 2.txt, 3.txt, 4.txt) and when the concatenate together (all.txt), that's the file what I want:
cat 1.txt 2.txt 3.txt 4.txt > all.txt
However, I don't want ...
-2
votes
1
answer
3k
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cat /dev/zero | pv > /dev/null [closed]
cat /dev/zero | pv > /dev/null
What exactly happens here and what determines the speed of this process.
Even on low end hardware you get a couple of GB/s transfer speeds like this.
5
votes
1
answer
58k
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Use of unused pairs in cat5 ethernet cables? [duplicate]
Cat5 ethernet cables use only 2 pairs for Ethernet what are the other 2 pairs for ?
Pin Color Function
1 White with Green +TD
2 Green -TD
3 White with Orange +...
9
votes
2
answers
3k
views
Cat, Grep, Redirect Output.... Blank File?
I just ran
cat /opt/webapplications/Word/readme.log | grep -v 'Apple'
and I got the output on the cli that I was expecting, which was all the lines in readme.log that did not contain 'Apple'...
...
-3
votes
3
answers
105
views
Trying to double the size of a file fails [closed]
I'm trying to create a large random file on a ramdisk, in order to do some tests. I've created the ramdisk and my starting file (from /dev/urandom) without much trouble, but I'm having trouble ...
4
votes
3
answers
601
views
How can I combine two commands to tally data from compressed and uncompressed log files?
I am running this command to get a tally of failed login attempts from a server’s auth.log and it works well:
sudo cat /var/log/auth.{log,log.1} | grep 'Failed password' | grep sshd | awk '{print $1,$...
1
vote
1
answer
1k
views
Running CAT in SCREEN no output to file
I am trying to code this command to run in screen along with 2 others that will be using cat to read a file then pipe it into awk for filtering. Here is the command;
screen -d -m /bin/cat /var/www/...
1
vote
3
answers
318
views
How to grep (or other command?) for first instance to last instance in a log?
How does one grep/search a text file so that the results show the first line with the string, and then every other line until the last line with the string?
So, if I have a file that looks like this:
...
0
votes
2
answers
50
views
8x slower cat for the same files on the same disk but different directory
I'm having an issue where I have 8x slower access to a set of files as compared to the same files in another directory on a linux machine.
The filesystem is a 36TB RAID-5 filesystem exported from a ...
0
votes
1
answer
614
views
Restarting HAProxy with -st flag returns error
I'm restarting HAproxy (on Ubuntu Server x64 14.04) with the following command
haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -st $(cat /var/run/haproxy.pid)
However, when actually ...
4
votes
1
answer
3k
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Loading a big database dump into PostgreSQL using cat
I have a pair of very large (~17 GB) database dumps that I want to load into postgresql 9.3. After installing the database packages, learning more or less how to use them, and fiddling around a little ...
3
votes
1
answer
4k
views
Cat a file(raw) to UDP at specific bitrate
I'm looking for a way to transfer a file over UDP at an specific bitrate. I can use netcat for example like this:
cat file | nc -u 192.168.x.x 5000
And I use a custom application to listen at port ...
6
votes
3
answers
7k
views
View file contents on a Salt Stack minion
How do I output the contents of a file on all my minions using Salt Stack?
The only 'pull' functionality I can find is in this minion push commit, but this requires configuration changes on the ...
0
votes
1
answer
81
views
Why is Cat quoting individual words in command substitution
All,
I'm attempting to use command substitution to keep command line arguments in a file. My initial thought was to simply place the command line arguments in a single line in a file and then call ...
6
votes
6
answers
34k
views
What am I doing wrong with this cat 6 patch panel wiring?
top number is transmitter
bottom number is remote terminator
12345678
36145278
is this because I could be mixing T568A and T568B wiring? how do I know if my patch cord is A or B? Do I just look at ...
5
votes
5
answers
4k
views
How to concat rotated logs back together
How to concatenate the rotated logs back together to make the original file?
huali-access.log huali-access.log.15 huali-access.log.21 huali-access.log.28 huali-access.log.34 huali-access.log....
6
votes
1
answer
1k
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File size limit exceeded in bash
I have tried this shell script on a SUSE 10 server, kernel 2.6.16.60, ext3 filesystem
the script has problem like this:
cat file | awk '{print $1" "$2" "$3}' | sort -n > result
the file's size ...
1
vote
1
answer
2k
views
How to combine files with unix cat command based on file name, then rename?
I have a bunch of CSV files in a directory like:
modfinalak_1.csv
modfinalal_1.csv
modfinalal_2.csv
modfinalal_3.csv
modfinalar_1.csv
modfinalar_2.csv
so it's one or multiple files per each US state ...
11
votes
1
answer
3k
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How to concatenate streams?
I know cat can concatenate files, but I need to concatenate a mix of files and streams and pipe the result to another process.
To make the question more concrete, I want to concatenate cat abc.sql ...
5
votes
2
answers
3k
views
tail -f without the tail?
Is there a command in Solaris to read a file, and when it gets to the end to stream the way tail does? I need to read the file from the start, and it is a binary file.
Information on Solaris and ...
0
votes
2
answers
524
views
X3440 cat /proc/cpuinfo question
im wondering is this normal?
[root@RPDS181 ~]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 30
model name : Intel(R) Xeon(R) CPU ...
4
votes
2
answers
19k
views
help with expect script, run cat on remote comp and get output of it to the variable
I have a bash+expect script which has to connect via ssh to the remote comp, read the file there, find specific line with the "hostname" (like "hostname aaaa1111") and store this hostname into the ...
2
votes
2
answers
488
views
Locate a string in a folder and the file it came from?
I am trying to find some keywords in my /var/log directory, so using
cd /var/log
cat * | grep keyword
I find the string is in that directory and see the lines it exists on, but don't know which ...
8
votes
2
answers
14k
views
cat * | grep something... what file is the result in?
If one was to run the following command
cat * | grep DATABASE
the shell would spit out all the lines in * files that contained the word DATABASE in them. Is there any way to also spit out what file ...
0
votes
2
answers
2k
views
How to clone with cat?
I want to clone an 8.1gig bootable disk to an 8.0gig disk and have the clone remain bootable.
dd causes problems because the destination disk is a few mb smaller than the source.
Can "cat" help me ...
0
votes
2
answers
3k
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cat or vi a file, hangs
we're having some issue on a SUN 5.8 machine.
first of all, the server is on his network (i.e. 10.x.x.x) and we can login using an ssh server which is on another network (196.x.x.x), so there're ...
1
vote
4
answers
135
views
Locate a particular string in a directory
I want to do the following:
cat *.xml | grep some_string_here
This tells me if a particular string exists in an xml file in a directory. Unfortunately it does not tell me which file.
how can I do ...
38
votes
3
answers
29k
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Linux: cat with separators among files
In Linux if you type cat *, you will get something like this:
line1 from file1
line2 from file1
line1 from file2
line1 from file3
line2 from file3
line3 from file3
What I would like is to display ...