Transcript find command - WordPress.com

UNIX
find command
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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
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Syntax: find where-to-lookup criteria/filename
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Wild cards: find /tmp fi*
find command
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We can use this command to find out files which were
modified in last 10 minutes
find . -mmin -10
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The above lists all the files in current directory which were
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modified 10 minutes back
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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.
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find .
will display the path names of all files in the current
directory and all sub directories.
Processes
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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
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ps
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Options: ps -all
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ps -ef
kill command
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kill command is used to terminate a running
process
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kill -9 PID
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PID: Process ID
wc command
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wc command is used to count how many lines, words,
and characters there are in a file
syntax :wc filename
tar command
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Create Tape ARchives (TAR) and add or extract files.
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Options: tar [options] filename.tar filename
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Creating a tar file:
tar -cvf file.tar file
Extracting the files from a tar file:
tar -xvf file.tar
Compress a file/directory
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tar -zcvf archive-name.tar.gz directory-name
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Where,
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-z: Compress archive using gzip program
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-c: Create archive
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-v: Verbose i.e display progress while
creating archive
-f: Archive File name
tar -zxvf archive-name.tar.gz
-x :Extract files
gzip command
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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
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The grep command allows you to search one file or
multiple files for lines that contain a pattern.
Grep “string” filename
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If any match found it displays “string”.
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If not it wont display any thing
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Case insensitive search using grep -i
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Syntax: grep -i "string" FILE
uname
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uname: command is used display operating system
information
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it gives name,version and 32 bit/64bit of the operating
system
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x86_64 when it is an kernel 64 bits
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i686 for 32 bits kernel
Questions???
Thank You