UNIX

find command ● The find command is used to locate files on a Unix or Linux system. find will search any set of directories you specify for files that match the supplied search criteria ● Syntax: find where-to-lookup criteria/filename ● Wild cards: find /tmp fi*

find command ● We can use this command to find out files which were modified in last 10 minutes ● find. -mmin -10 ● The above lists all the files in current directory which were ● modified 10 minutes back ● find. -mtime 0 # find files modified between now and 1 day ago # (i.e., within the past 24 hours) ● find. -mtime -1 # find files modified less than 1 day ago

find command find. -name '*' -size +1M In the above example the system would search for any file that is larger then 1MB. ● find. ● will display the path names of all files in the current directory and all sub directories.

Processes ● A process is a program in execution. Every time you invoke a system utility or an application program from a shell, one or more "child" processes are created by the shell in response to your command. All UNIX processes are identified by a unique process identifier or PID. ● We have one command to display current running processes ● ps ● Options: ps -all ● ps -ef

kill command ● kill command is used to terminate a running ● process ● kill -9 PID ● PID: Process ID

wc command ● wc command is used to count how many lines, words, and characters there are in a file ● syntax :wc filename

tar command ● Create Tape ARchives (TAR) and add or extract files. ● Options: tar [options] filename.tar filename ● ● Creating a tar file: ● tar -cvf file.tar file ● Extracting the files from a tar file: ● tar -xvf file.tar

Compress a file/directory ● tar -zcvf archive-name.tar.gz directory-name ● Where, ● -z: Compress archive using gzip program ● -c: Create archive ● -v: Verbose i.e display progress while creating archive ● -f: Archive File name ● tar -zxvf archive-name.tar.gz ● -x :Extract files

gzip command ● gzip reduces the size of the files ● To compress a file with gzip, pass the filename as an argument : ● gzip file.txt ● To uncompress, use gunzip: ● gunzip file.txt.gz ● or ● gzip -d file.txt.gz

grep command ● The grep command allows you to search one file or multiple files for lines that contain a pattern. ● Grep “string” filename ● If any match found it displays “string”. ● If not it wont display any thing ● Case insensitive search using grep -i ● Syntax: grep -i "string" FILE

uname ● uname: command is used display operating system information ● it gives name,version and 32 bit/64bit of the operating system ● x86_64 when it is an kernel 64 bits ● i686 for 32 bits kernel

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