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grep - Search file for character string Search for one or more strings in one or more files. Examples:- grep that myfile.txt Look for the string ``that'' in the file called ``myfile.txt'' and print out each line that matches. egrep -in "this|that" *.dat Extended grep search *.dat files for ``this'' or ``that'' case insensitive (-i) and where found print line number (-n) along with the line contents. Show Sample Output

Show Sample Output

If all three Session IDs are the same, then you've got SSL session caching running. @ http://hezmatt.org/~mpalmer/blog/general/ssl_session_caching_in_nginx.html Show Sample Output

With a couple of little commands, you?ll be able to ignore the .DS_Store files forever from your git repositories on mac! The following command will add the .gitignore file to the git configuration git config --global core.excludesfile ~/.gitignore then, the following, will add the .DS_Store to the list echo .DS_Store >> ~/.gitignore

Using sed to extract lines in a text file If you write bash scripts a lot, you are bound to run into a situation where you want to extract some lines from a file. Yesterday, I needed to extract the first line of a file, say named somefile.txt. cat somefile.txt Line 1 Line 2 Line 3 Line 4 This specific task can be easily done with this: head -1 somefile.txt Line 1 For a more complicated task, like extract the second to third lines of a file. head is inadequate. So, let's try extracting lines using sed: the stream editor. My first attempt uses the p sed command (for print): sed 1p somefile.txt Line 1 Line 1 Line 2 Line 3 Line 4 Note that it prints the whole file, with the first line printed twice. Why? The default output behavior is to print every line of the input file stream. The explicit 1p command just tells it to print the first line .... again. To fix it, you need to suppress the default output (using -n), making explicit prints the only way to print to default output. sed -n 1p somefile.txt Line 1 Alternatively, you can tell sed to delete all but the first line. sed '1!d' somefile.txt Line 1 '1!d' means if a line is not(!) the first line, delete. Note that the single quotes are necessary. Otherwise, the !d will bring back the last command you executed that starts with the letter d. To extract a range of lines, say lines 2 to 4, you can execute either of the following: sed -n 2,4p somefile.txt sed '2,4!d' somefile.txt Note that the comma specifies a range (from the line before the comma to the line after). What if the lines you want to extract are not in sequence, say lines 1 to 2, and line 4? sed -n -e 1,2p -e 4p somefile.txt Line 1 Line 2 Line 4 Show Sample Output

deletes line 3 in known_hosts text file

To start X11 display only on your local machine: xeyes & Extensions to basic command: ssh -X -f user@remotehost xcalc -bg black -fg green

The output will likely point to '/etc/alternatives/java'. So find out where that points by issuing ls -l like this: ls -l /etc/alternatives/java

I cannot run Tomcat from Eclipse. It says that there?s other process that is running on port 8080, but I don?t know what is the process, and how to stop it from the Services manger in Windows. So here?s how you can kill and find out what is that process: To find out what PID 8080 was (hopefully not a trojan) I typed tasklist /FI ?PID eq 8080″ taskkill /F /PID 2600