Hi Guys, To start with I am intermediate user of Linux and use RedHat at work and Ubuntu at home. I had this job where I have to search my apache server logs for some "text". Count the number of lines that have this "text" in them. Well I know basic shell scripting so I just used a bit of basic commands to get what I wanted. If you know other better solution please leave yours in comments. [crayon-64832a520dfaf086613616/] So DIRPATH above holds path to my access logs directory and I am iterating over to get line count of files one by one and my COUNTTOTAL variable holds the overall count. Above example show to count all lines and summing the output. In the example below lets make a slight change and search for a string "abc.com" and see how many lines have this string present. [crayon-64832a520dfb2903743664/] [crayon-64832a520dfb3385306043/] [crayon-64832a520dfb4769755302/] As you can see that we now are searching text "abc.com" in a file and piping the output to wc command adding the output to our global variable COUNTTOTAL and printing it using echo command. you should change DIRPATH to suit you. You can use the same fundamentals to create a dynamic list of file e.g. count the number of lines for files that are younger than 30 day, and iterate over them. We have used the following command in our shell scripts and each of the one have link to their manual page grep wc cut As my mate David Overton pointed out that above can be achieved without a script so here are our shell commands to do exactly the same thing. I think I am just stuck with scripting mind frame :) First command (equivalent to first script): [crayon-64832a520dfb5207213650/] Second command (equivalent to second script) : [crayon-64832a520dfb6990676176/] I hope that this helps. If I made any mistake please let me know. Cheers     … [Read more...]

Hi Guys, I guess this is a quick tip. Question is How we can create a tar.gz and tar.bz2 in Linux. I use these commands so often that I thought I should share because it could be helpful information. I am not exactly a Linux Pro but more of an intermediate user so your input will be always welcomed. Ok first I started using zip command in Linux a while back and loved it. It was quick and easy and was supported on many OS's like Linux and windows or even Mac. Compression with zip isn't always great then comes tar Now if you just use tar to compress a file that doesn't mean that you are compressing that file or group of files. Its more like packaging a file or group of files and folders. So basic usage of tar is shown below [crayon-64832a520e9a1641983524/] and to extract the above package you use this   [crayon-64832a520e9a3952631699/] -c above means create -x means extract The size is pretty much the same when you tar your files because it is just creating a archive for you files. Now lets jump into file compression using tar tar has to be told what algorithm need to be used to  compress your files and directories. So to lets use GZip If you take a look at man page http://unixhelp.ed.ac.uk/CGI/man-cgi?tar You will notice that flag -z can be used to create a GZipped file which Lets change the above tar command that creates of package to the once below to create a Compressed Archive [geshi lang="text" nums="1" target="_self" ] [crayon-64832a520e9a4837538846/] Notice that we added -z and .gz in the file extension. I added .gz so that I am clear when extracting an archive what algo I will need to use to extract the above So lets extract it [geshi lang="text" nums="1" target="_self" ] [crayon-64832a520e9b0994174172/] See that because now I am aware that its gzipped from the extension thus I added -z to my flags else it will fail to extract if different algo is used to try to extract this archive. For me … [Read more...]

Hi Guys, I thought this may help you in some way. I am only a intermediate user of Linux but like to share stuff that I think could be useful to others. One of those things is How to count number of files in a given directory Well in simplest form browse to your directory and type this [geshi lang="text" nums="1" target="_self" ] # ls   | wc -l [crayon-64832a520eac9121625322/] [crayon-64832a520eacb496130053/] What this does is that its piping the output of list command to word count command. so if ls  return N number of lines then wc -l will be N. Second way to do it is just executing ls -l command as shown below [geshi lang="text" nums="1" target="_self" ] [user@web folder]# ls -l total 1397304 Notice the total value that the number of lines there. Now in the above command symbolic links are counted as files and also subdirectories get returned. You can have subdiretories excluded as shown with another Linux command called find [geshi lang="text" nums="1" target="_self" ] [crayon-64832a520eacc347383727/] -type f means read files only. So no symlinks are returned.   I hope that you found this post useful Cheers,   Advertisement     … [Read more...]

Hi Guys, We learn something new everyday. I did too. I know I am a late learner but its better late than never.   I asked myself a question about how to write multiple lines using say echo to a file. I generally will open my vi editor and and write something there and then save my file. and when I am using echo I never really had that situation where I need to write multiple lines to a file. But things changed :) Normally I will do something like this   Above will write word hello to file named test.txt in your current directory [crayon-64832a520eb9b941521844/]     Let me show you how to write multiple lines Trick is when you start you echo command follow it with " (double quotes) and don't close them until you are finished with your sentense as shown below [crayon-64832a520eb9d138415420/] Above will write "Sit lectus dis placerat non aenean ultrices. Tempor, amet nisi in arcu, amet turpis, cras mattis ultrices, enim, penatibus. "  to your test.txt file. I hope this helps Cheers     … [Read more...]