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Linux Online Training | Free Demo | QuontraSolutions

QuontraSolutions is a Global Interactive Online IT Training Portal started by Experts with an aspire to provide a Job Oriented IT Online Training on major modules. We provide Hands on online Linux Training with real time scenarios . QuontraSolutions online training could be described in one word by its students, Linux online training we provide with a real time support by our Industry IT experts. We are passionate about how to improve the IT skills by helping you to develop the skills you need in order to accomplish your objective. One free demo will be given before sign up for Online Training Web:www.quontrasolutions.co.uk Email : info@quontrasolutions.co.uk Call us: 20-3734-1498

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Linux Online Training | Free Demo | QuontraSolutions

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  1. Presented By QuontraSolutions Attend Free Demo Linux Commands Call Us : 20-3734-1498 Email: info@quontrasolutions.co.uk Website:www.quontrasolutions.co.uk

  2. Topics • head • tail • link • tar • gzip and gunzip • touch • diff

  3. ‘head’ command Displays the first ten lines of a file, unless otherwise stated. Syntax: head [-number | -n number] filename Example: head -15 myfile.txt It displays the first 15 lines of ‘myfile.txt’ .

  4. ‘head’ command Displays the first ten lines of a file, unless otherwise stated. Syntax: head [-number | -n number] filename Example: head -15 myfile.txt It displays the first 15 lines of ‘myfile.txt’ .

  5. ‘tail’ command Displays the last ten lines of a file, unless otherwise stated. Syntax: • tail [-n number] [-l] [-b] [-c] [-r] [-f] [file]

  6. ‘link’ command Creates a link to the file or directory. Syntax: ln [-f] [-n] [-s] [-i] source destination

  7. Example: ln –s f1 home/myfiles/f2 Creates a symbolic link between file ‘f1’ to file ‘f3’ of ‘myfiles’ directory. Represented as ‘’ • View the Link using : ls –l • Remove the link using ‘rm’ command. rm –r f1.

  8. ‘tar’ command Used to group set of files in to ma single file. It is called Archive file. Syntax: tar [-c] [-t or -v] [-x] [-f] filename archivefilename • It has ‘.tar’ extension.

  9. Examples: • Create an archive file tar –vcf dir1 myarc.tar It creates archive file ‘myarc.tar’ which has all files of directory ‘dir1’. 2. Dearchive an archive file tar –xvf myarc.tar All files in ‘dir1’ are no more grouped, they are separated.

  10. ‘gzip’ and ‘gunzip’ Used to compress and decompress the file respectively. Syntax: gzip [-f][-d] filename. gunzip [-f] compressedfilename. • It is with ‘.gz’ extension.

  11. Examples: • Compress the file. gzip –f f1. Compresses the file ‘f1’ and is represented as ‘f1.gz’. 2. Decompress the compressed file. gzip –d f1.gz or gunzip –f f1.gz File ‘f1.gz’ is decompressed to file ‘f1’.

  12. ‘touch’ command Used to change the timestamp of a file. It is also used to create multiple files at one shot. Syntax: touch –t [-a][-m] [-r reference-file] filename

  13. Use ‘Stat’ command to know the Timestamp. $ stat f1.c (sample output) Access: 2010-11-01 20:35:58.000000000 +0530 Modify: 2010-11-01 20:35:58.000000000 +0530 Change: 2010-11-01 20:35:58.000000000 +0530 Format for touch -t is : [YY]MMDDhhmm[.ss]

  14. Examples: • Create multiple files at once. $ touch file1.txt file2.txt file3.txt 2. Change the access time of a file. $ touch –t -a 08210820 file1.txt Access: 2010-06-15 13:30:00.000000000 +0530 Modify: 2010-08-21 08:20:00.000000000 +0530 Change: 2010-11-01 20:45:05.000000000 +0530

  15. Same way we can change the modified time of a file using ‘-m’ along with ‘-t’ 4. Refer the timestamp of another file than the current time. $touch -r file4 file5 file 5 uses the timestamp of file4.

  16. ‘diff’ command It is used to find differences between two files. Syntax: diff [options] file1 file2 Options:

  17. Let us have two files, file1.txt and file2.txt as follows:

  18. Examples: 1. Compare the files side by side, ignoring white space.diff -by file1.txt file2.txt LINUX TEST LINUX TEST hscripts.com | HSCRIPTS.com with great thoughts with great thoughts Lead India < 2. Compare the files side by side, ignoring Case.diff -iy file1.txt file2.txt LINUX TEST LINUX TEST hscripts.com HSCRIPTS.com with great thoughts | with great thoughts Lead India <

  19. Thankyou

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