Chapter 10 Advanced file processing Commands rm file

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Chapter 10 Advanced file processing

Chapter 10 Advanced file processing

Commands • rm file* • rm file? • rm f? l? ^ $ Regular

Commands • rm file* • rm file? • rm f? l? ^ $ Regular Expressions/special characters/Meta characters -It will remove all the files starting from the name file no matter how lengthy there name is, will remove file 1, file 111, fileabc 43 er, fileg * is a meta character which has a special meaning behind it (meaning every thing) -It will remove all the files starting from the name file and just one more extra character in the name, will remove file 1, file. B, filec, file 8. ? again is a meta character which has a special meaning behind it (meaning just one character or letter), it acts like a fill in the blank -It will remove all the files starting with the first letter f and the second may be any character/number , third letter must be l and fourth may be any character/number f just one more, will remove file, f. Bl 2, f 5 l 7, f 9 le, f 3 lg. ? again is a meta character which has a special meaning behind it (meaning just one character or letter), it acts like a fill in the blank, in this example there are two fill in the blanks beginning of line End of line

Compressing a file compress gzip gzexe(executable) pack option -v, f -v, t, f, r,

Compressing a file compress gzip gzexe(executable) pack option -v, f -v, t, f, r, d -d uncompress gunzip gzexe -d unpack extension limitations. Z. gz ~(with the previous state and a backup). z not applicable on a file greater than 8 MB size

Compressing a file compress filea uncompress filea. Z compress -v filea fileb filec uncompress

Compressing a file compress filea uncompress filea. Z compress -v filea fileb filec uncompress -fv filea. Z fileb. Z

Compressing a file gzip File gzip file 22 gunzip file 22. gz Directory gzip

Compressing a file gzip File gzip file 22 gunzip file 22. gz Directory gzip -v –f –r dir. A gunzip -r dir. A. gz

Compressing a file compress an executable file Executable file gzexe banner ls –l 764

Compressing a file compress an executable file Executable file gzexe banner ls –l 764 banner 1054 banner~ gzexe –d banner ls –l 764 banner~ 1054 banner a backup of precious state

Compressing a file pack filea unpack filea. z

Compressing a file pack filea unpack filea. z

Reading a compressed file gzip file 22 more file 22. gz 9843 j 3409

Reading a compressed file gzip file 22 more file 22. gz 9843 j 3409 j 09&$%^$%dsfgs%$6 dfsgdf 435 DSFg 456$%7!@@!@2 ffg hj. Uu 74(()g^^345 Gdf#@$%&^&*(&$ER %$^$#NGFf cat file 22. gz 9843 j 3409 j 09&$%^$%dsfgs%$6 dfsgdf 435 DSFg 456$%7!@@!@2 ffg hj. Uu 74(()g^^345 Gdf#@$%&^&*(&$ER %$^$#NGFf

Reading a compressed file zmore file 22. gz We should always respect our parents

Reading a compressed file zmore file 22. gz We should always respect our parents and teachers. We will obey Allah because Allah love us more then 70 Times than our real mother zcat file 22. gz We should always respect our parents and teachers We will obey Allah because Allah love us more then 70 Times than our real mother

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com 546372 896574 854977 789475 115889 sort naughty_students Ali Bilal Daud Usman Zubair Sultan Malik Khan Raza Ameen A. rashid@aol. com bilal. m@yahoo. com d. k@hotmail. com usman@yahoo. com zubair. a@gmail. com 854977 789475 546372 896574 115889

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com 546372 896574 854977 789475 115889 sort +1 naughty_students Zubair Daud Bilal Usman Ali Ameen zubair. a@gmail. com 115889 Khan d. k@hotmail. com 546372 Malik bilal. m@yahoo. com 789475 Raza usman@yahoo. com 896574 Sultan A. rashid@aol. com 854977

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com 546372 896574 854977 789475 115889 sort +2 -r –b naughty_students Zubair Usman Daud Bilal Ali Ameen Raza Khan Malik Sultan zubair. a@gmail. com usman@yahoo. com d. k@hotmail. com bilal. m@yahoo. com A. rashid@aol. com 115889 896574 546372 789475 854977

Searching a file in Unix directory structire command: find Command to Find a file

Searching a file in Unix directory structire command: find Command to Find a file /home Searching location command: whereis ftp tar ls -name pakistan. gif Indicate that next work is the actual name of a file Name of the file that is to be searched -print Print the result on the screen

Searching a pattern in a file cat naughty_students Daud Khan d. k@hotmail. com Usman

Searching a pattern in a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com 546372 896574 854977 789475 115889 grep Raza naughty_students Usman Raza usman@yahoo. com 896574 grep –n Raza naughty_students 2 Usman Raza usman@yahoo. com 896574

Searching a pattern in a file cat naughty_students Daud Khan d. k@hotmail. com Usman

Searching a pattern in a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com 546372 896574 854977 789475 115889 grep ‘^[A-D]’ naughty_students Daud Ali Bilal Khan Sultan Malik d. k@hotmail. com A. rashid@aol. com bilal. m@yahoo. com 546372 854977 789475 grep ‘<A’ naughty_students Ali Zubair Sultan A. rashid@aol. com 854977 Ameen zubair. a@gmail. com 115889

Searching a pattern in a file cat naughty_students Daud Khan d. k@hotmail. com Usman

Searching a pattern in a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com 546372 896574 854977 789475 115889 egrep -n “Ali|Ameen” naughty_students 3 Ali 5 Zubair Sultan A. rashid@aol. com 854977 Ameen zubair. a@gmail. com 115889 egrep -v “Ali|Ameen” naughty_students Daud Khan Usman Raza Bilal Malik d. k@hotmail. com usman@yahoo. com bilal. m@yahoo. com 546372 896574 789475

Searching a pattern in a file fgrep: very good speed but not so flexible

Searching a pattern in a file fgrep: very good speed but not so flexible grep : good speed and flexible egrep: slow speed but very flexible

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com cut -fr 1, 2 naughty_students Zubair Daud Bilal Usman Ali Ameen Khan Malik Raza Sultan 546372 896574 854977 789475 115889

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com

Sorting a file cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com cut -f 1, 2, 4 naughty_students Daud Usman Ali Bilal Zubair Khan Raza Sultan Malik Ameen 546372 896574 854977 789475 115889

cut and paste cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com

cut and paste cat naughty_students Daud Khan d. k@hotmail. com Usman Raza usman@yahoo. com Ali Sultan A. rashid@aol. com Bilal Malik bilal. m@yahoo. com Zubair Ameen zubair. a@gmail. com 546372 896574 854977 789475 115889 cat Course monday Friday Tuesday Saturday Thursday Unix Php Java Linux oops paste naughty_students Course Daud Usman Ali Bilal Zubair Khan Raza Sultan Malik Ameen d. k@hotmail. com usman@yahoo. com A. rashid@aol. com bilal. m@yahoo. com zubair. a@gmail. com 546372 896574 854977 789475 115889 monday Unix Friday Php Tuesday Java Saturday Linux Thursday oops

Encrypt a file crypt key < original_file > encrypted_file crypt key < encrypted_file >

Encrypt a file crypt key < original_file > encrypted_file crypt key < encrypted_file > original_file crypt hskr 45@ < myfile > secretfile (encrypting) crypt hskr 45@ < secretfile > myfile (decrypting)

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