This should be a no-brainer, but apparently I have no brain today.
I have 50 20-gig logs that contain entries from multiple apps, one of which addes a transaction ID to its log lines. I have 42 transaction IDs I need to review, and I'd like to parse out the appropriate lines into separate files.
To do a single file, the command would be simply,
grep CDBBDEADBEEF2020X02393 server.log* > CDBBDEADBEEF2020X02393.log
that creates a log isolated to that transaction, from all 50 server.logs.
Now, I have a file with 42 txnIDs (shortening to 4 here):
CDBBDEADBEEF2020X02393
CDBBDEADBEEF6548X02302
CDBBDE15644F2020X02354
ABBDEADBEEF21014777811
And I wrote:
#/bin/sh
grep $1 server.\* > $1.log
But that is not working. Changing the shebang to #/bin/bash -xv, gives me this weird output (obviously I'm playing with what the correct escape magic must be):
$ ./xtrakt.sh B7F6E465E006B1F1A
#!/bin/bash -xv
grep - ./server\.\*
' grep - './server.*
: No such file or directory
I have also tried the command line
grep - server.* < txids.txt > $1
But OBVIOUSLY that $1 is pointless and I have no idea how to get a file named per txid using the input redirect form of the command.
Thanks in advance for any ideas. I haven't gone the route of doing a foreach in the shell script, because I want grep to put the original filename in the output lines so I can examine context later if I need to.
Also - it would be great to have the server.* files ordered numerically (server.log.1, server.log.2 NOT server.log.1, server.log.10...)
try this:
while read -r txid
do
grep "$txid" server.* > "$txid.log"
done < txids.txt
and for the file ordering - rename files with one digit to two digit, with leading zeroes, e.g. mv server.log.1 server.log.01.
Related
I worked very little with scripts and I don't know..
I need to create a script (in Ubuntu) that copies only files where a certain user modified more than 20 lines at a given time.
I know that to copy a file elsewhere I use this code:
$ ls dir1/
dir2/
$ cp -r dir1/ dir1.copy
$ ls dir1.copy
dir2/
And to count lines: wc -l file1
But how could I check if a user has modified more than 20 lines in a file (eg a simple txt, for example today)?
Thank you in advance !
In the first place, if by "modifying lines in a file" you mean "adding lines to a file", then you can do something about it. If you are literally talking about modifying lines in files, there is nothing you can do to track that activity without setting up some version control first.
So, assuming we are talking about files in which your users will be adding lines, a workaround for that may consist of setting up some scheduled tasks to check the line numbers of those files "at a given time" (as you said) and compare that value to a previous result, and then if there are more than 20 additional lines than from the last value, copy the files elsewhere.
First things first, counting the lines of your files is something you have already mentioned and it is right: I will propose using wc -l too.
Once here you will need two things: one place (tipically a file) to periodically save the number of lines of your files at a given time and one trigger that would start copying the files in case there have been more than 20 lines added.
So for example, in this case you can set up a cron job, like this (i.e. to run every hour):
0 */1 * * * cat ${FILE} |wc -l > /tmp/${FILE}_counter
That one will check the number of lines of a given file and send the output to a temporary file that we will be using soon. In case you have multiple files you can easily script that and make a loop, like this:
#!/bin/bash
for FILE in file1 file2 file3; do
cat ${FILE} |wc -l > /tmp/${FILE}_counter
done
Don't forget to add the path to the script in the cron job if you do that this way. After that, you will have something like this in your /tmp directory:
/tmp/file1_counter
/tmp/file2_counter
/tmp/file3_counter
...
At this point you only need a trigger, which can be another script, to compare the current number of lines of a file at a given time and start copying it elsewhere in case there are more than 20 additional lines than in the previous check. Consider this:
#!/bin/bash
LAST_VALUE=$(cat /tmp/${FILE}_counter)
CURRENT_VALUE=$(cat ${FILE} |wc -l)
if [ ${CURRENT_VALUE} -gt $(expr ${LAST_VALUE} + 20) ]; then
# Your cp stuff here
fi
Of course you can add a loop here too in case of handling multiple files:
#!/bin/bash
LAST_VALUE=$(cat /tmp/${FILE}_counter)
CURRENT_VALUE=$(cat ${FILE} |wc -l)
for FILE in file1 file2 file3; do
if [ ${CURRENT_VALUE} -gt $(expr ${LAST_VALUE} + 20) ]; then
# Your cp stuff here
fi
done
Then you only have to add this last script to a cron job too, and you should be done.
Hope you find this useful.
You can use diff to compare 2 files. With the -u0 option, it will show you the added/deleted/modified lines, prefixed with "+" or "-". You can then count lines starting with "+" or "-" with grep and it's -c option.
So for the number of lines added or modified, which begin with "+" :
diff -u0 $file_before $file_after | grep -c '^+'
and this will count the deleted or modified lines, which start with "-" :
diff -u0 $file_before $file_after | grep -c '^-'
Note that there are 2 header lines in this format, which also start with "+" and "-", so you may want to take that in account.
I am trying to execute this in unix. So let's for example say I have five files named after dates, and in each of those files there are thousand of numerical values (six to ten digit number). Now, lets say I also have bunch of numerical values and I want to know which value belongs to which file.I am trying to do it the hard way like below but how do I put all my values in a file and just do a loop from there.
FILES:
20170101
20170102
20170103
20170104
20170105
Code:
for i in 5555555 67554363 564324323 23454657 666577878 345576867; do
echo $i; grep -l $i 201701*;
done
Or, why loop at all? If you have a file containing all your numbers (say numbers.txt you can find in which date file each are contained and on what line with a simple
grep -nH -w -f numbers.txt 201701*
Where the -f option simply tells grep to use the values contained in the file numbers.txt to search in each of the files matching 201701*. The -nH options for listing the line number and filename associated with each match, respectively. And as Ed points out below, the -w option to insure grep only select lines containing the whole word sought.
You can also do it with a while loop and read from the file if you create it as #Barmar suggested:
while read -r i; do
...
done < numbers.txt
Put the values in a file numbers.txt and do:
for i in $(cat numbers.txt); do
...
done
I have a folder filled with ~300 files. They are named in this form username#mail.com.pdf. I need about 40 of them, and I have a list of usernames (saved in a file called names.txt). Each username is one line in the file. I need about 40 of these files, and would like to copy over the files I need into a new folder that has only the ones I need.
Where the file names.txt has as its first line the username only:
(eg, eternalmothra), the PDF file I want to copy over is named eternalmothra#mail.com.pdf.
while read p; do
ls | grep $p > file_names.txt
done <names.txt
This seems like it should read from the list, and for each line turns username into username#mail.com.pdf. Unfortunately, it seems like only the last one is saved to file_names.txt.
The second part of this is to copy all the files over:
while read p; do
mv $p foldername
done <file_names.txt
(I haven't tried that second part yet because the first part isn't working).
I'm doing all this with Cygwin, by the way.
1) What is wrong with the first script that it won't copy everything over?
2) If I get that to work, will the second script correctly copy them over? (Actually, I think it's preferable if they just get copied, not moved over).
Edit:
I would like to add that I figured out how to read lines from a txt file from here: Looping through content of a file in bash
Solution from comment: Your problem is just, that echo a > b is overwriting file, while echo a >> b is appending to file, so replace
ls | grep $p > file_names.txt
with
ls | grep $p >> file_names.txt
There might be more efficient solutions if the task runs everyday, but for a one-shot of 300 files your script is good.
Assuming you don't have file names with newlines in them (in which case your original approach would not have a chance of working anyway), try this.
printf '%s\n' * | grep -f names.txt | xargs cp -t foldername
The printf is necessary to work around the various issues with ls; passing the list of all the file names to grep in one go produces a list of all the matches, one per line; and passing that to xargs cp performs the copying. (To move instead of copy, use mv instead of cp, obviously; both support the -t option so as to make it convenient to run them under xargs.) The function of xargs is to convert standard input into arguments to the program you run as the argument to xargs.
First off, I'm really bad at shell, as you'll notice :)
Now then, I have the following task: The script gets two arguments (fileName, N). If the number of lines in the file is greater then N, then I need to cut the last N lines, then overwrite the contents of the file with it.
I thought of saving the contents of the file into a variable, then just cat-ing that to the file. However for some reason it's not working.
I have problems with saving the last N lines to a variable.
This is how I tried doing it:
lastNLines=`tail -$2 $1`
cat $lastNLines > $1
Your lastNLines is not a filename. cat takes filenames. You also cannot open the input file for writing, because the shell truncates it before tail can get to it, which is why you need to use a temporary file.
However, if you insist on not using a temporary file, here's a non-portable solution:
tail -n$2 $1 | sponge $1
You may need to install moreutils for sponge.
The arguments cat takes are file names, not the content.
Instead, you can use a temp file, like this:
tail -$2 $1 > $1._tmp
mv $1._tmp $1
To save the content to a variable, you can do what you already included in your question, or:
lastNLines=`cat $1`
(after the mv command, of course)
I need to accomplish the following things with bash scripting in FreeBSD:
Create a directory.
Generate 1000 unique files whose names are taken from other random files in the system.
Each file must contain information about the original file whose name it has taken - name and size without the original contents of the file.
The script must show information about the speed of its execution in ms.
What I could accomplish was to take the names and paths of 1000 unique files with the commands find and grep and put them in a list. Then I just can't imagine how to remove the path part and create the files in the other directory with names taken from the list of random files. I tried a for loop with the basename command in it but somehow I can't get it to work and I don't know how to do the other tasks as well...
[Update: I've wanted to come back to this question to try to make my response more useful and portable across platforms (OS X is a Unix!) and $SHELLs, even though the original question specified bash and zsh. Other responses assumed a temporary file listing of "random" file names since the question did not show how the list was constructed or how the selection was made. I show one method for constructing the list in my response using a temporary file. I'm not sure how one could randomize the find operation "inline" and hope someone else can show how this might be done (portably). I also hope this attracts some comments and critique: you never can know too many $SHELL tricks. I removed the perl reference, but I hereby challenge myself to do this again in perl and - because perl is pretty portable - make it run on Windows. I will wait a while for comments and then shorten and clean up this answer. Thanks.]
Creating the file listing
You can do a lot with GNU find(1). The following would create a single file with the file names and three, tab-separated columns of the data you want (name of file, location, size in kilobytes).
find / -type f -fprintf tmp.txt '%f\t%h/%f\t%k \n'
I'm assuming that you want to be random across all filenames (i.e. no links) so you'll grab the entries from the whole file system. I have 800000 files on my workstation but a lot of RAM, so this doesn't take too long to do. My laptop has ~ 300K files and not much memory, but creating the complete listing still only took a couple minutes or so. You'll want to adjust by excluding or pruning certain directories from the search.
A nice thing about the -fprintf flag is that it seems to take care of spaces in file names. By examining the file with vim and sed (i.e. looking for lines with spaces) and comparing the output of wc -l and uniq you can get a sense of your output and whether the resulting listing is sane or not. You could then pipe this through cut, grep or sed, awk and friends in order to to create the files in the way you want. For example from the shell prompt:
~/# touch `cat tmp.txt |cut -f1`
~/# for i in `cat tmp.txt|cut -f1`; do cat tmp.txt | grep $i > $i.dat ; done
I'm giving the files we create a .dat extension here to distinguish them from the files to which they refer, and to make it easier to move them around or delete them, you don't have to do that: just leave off the extension $i > $i.
The bad thing about the -fprintf flag is that it is only available with GNU find and is not a POSIX standard flag so it won't be available on OS X or BSD find(1) (though GNU find may be installed on your Unix as gfind or gnufind). A more portable way to do this is to create a straight up list of files with find / -type f > tmp.txt (this takes about 15 seconds on my system with 800k files and many slow drives in a ZFS pool. Coming up with something more efficient should be easy for people to do in the comments!). From there you can create the data values you want using standard utilities to process the file listing as Florin Stingaciu shows above.
#!/bin/sh
# portably get a random number (OS X, BSD, Linux and $SHELLs w/o $RANDOM)
randnum=`od -An -N 4 -D < /dev/urandom` ; echo $randnum
for file in `cat tmp.txt`
do
name=`basename $file`
size=`wc -c $file |awk '{print $1}'`
# Uncomment the next line to see the values on STDOUT
# printf "Location: $name \nSize: $size \n"
# Uncomment the next line to put data into the respective .dat files
# printf "Location: $file \nSize: $size \n" > $name.dat
done
# vim: ft=sh
If you've been following this far you'll realize that this will create a lot of files - on my workstation this would create 800k of .dat files which is not what we want! So, how to randomly select 1000 files from our listing of 800k for processing? There's several ways to go about it.
Randomly selecting from the file listing
We have a listing of all the files on the system (!). Now in order to select 1000 files we just need to randomly select 1000 lines from our listing file (tmp.txt). We can set an upper limit of the line number to select by generating a random number using the cool od technique you saw above - it's so cool and cross-platform that I have this aliased in my shell ;-) - then performing modulo division (%) on it using the number of lines in the file as the divisor. Then we just take that number and select the line in the file to which it corresponds with awk or sed (e.g. sed -n <$RANDOMNUMBER>p filelist), iterate 1000 times and presto! We have a new list of 1000 random files. Or not ... it's really slow! While looking for a way to speed up awk and sed I came across an excellent trick using dd from Alex Lines that searches the file by bytes (instead of lines) and translates the result into a line using sed or awk.
See Alex's blog for the details. My only problems with his technique came with setting the count= switch to a high enough number. For mysterious reasons (which I hope someone will explain) - perhaps because my locale is LC_ALL=en_US.UTF-8 - dd would spit incomplete lines into randlist.txt unless I set count= to a much higher number that the actual maximum line length. I think I was probably mixing up characters and bytes. Any explanations?
So after the above caveats and hoping it works on more than two platforms, here's my attempt at solving the problem:
#!/bin/sh
IFS='
'
# We create tmp.txt with
# find / -type f > tmp.txt # tweak as needed.
#
files="tmp.txt"
# Get the number of lines and maximum line length for later
bytesize=`wc -c < $files`
# wc -L is not POSIX and we need to multiply so:
linelenx10=`awk '{if(length > x) {x=length; y = $0} }END{print x*10}' $files`
# A function to generate a random number modulo the
# number of bytes in the file. We'll use this to find a
# random location in our file where we can grab a line
# using dd and sed.
genrand () {
echo `od -An -N 4 -D < /dev/urandom` ' % ' $bytesize | bc
}
rm -f randlist.txt
i=1
while [ $i -le 1000 ]
do
# This probably works but is way too slow: sed -n `genrand`p $files
# Instead, use Alex Lines' dd seek method:
dd if=$files skip=`genrand` ibs=1 count=$linelenx10 2>/dev/null |awk 'NR==2 {print;exit}'>> randlist.txt
true $((i=i+1)) # Bourne shell equivalent of $i++ iteration
done
for file in `cat randlist.txt`
do
name=`basename $file`
size=`wc -c <"$file"`
echo -e "Location: $file \n\n Size: $size" > $name.dat
done
# vim: ft=sh
What I could accomplish was to take the names and paths of 1000 unique files with the commands "find" and "grep" and put them in a list
I'm going to assume that there is a file that holds on each line a full path to each file (FULL_PATH_TO_LIST_FILE). Considering there's not much statistics associated with this process, I omitted that. You can add your own however.
cd WHEREVER_YOU_WANT_TO_CREATE_NEW_FILES
for file_path in `cat FULL_PATH_TO_LIST_FILE`
do
## This extracts only the file name from the path
file_name=`basename $file_path`
## This grabs the files size in bytes
file_size=`wc -c < $file_path`
## Create the file and place info regarding original file within new file
echo -e "$file_name \nThis file is $file_size bytes "> $file_name
done