Operating System Linux Commands Example

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execute last particular command

!command

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it returns the path of that file

find -name "file name"

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Return the file path but ignore the Case

ex test,Test,TEST

 find -iname test

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find the all others file and skip the given file name(Find in all dir.)

find -not -name test

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find in all current Dir..

find -maxdepth 1 -name filenaem

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find with in 1 level dir

dir 1(test.txt)->dir 11(test.txt)->dir 12(test.txt)

dir 2(test.txt)->dir

 find -maxdepth 2  -name test

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find the file from the Specific Levels of dir

1 level to 4

 find -maxdepth 4 -mindepth 1  -name test

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find file which is modified after the given file name

 find -anewer test

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find all file which is modified last 10 mins

find . -mmin -10

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find the all which are only Files

$ find . -type f

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find -mtime -24

 will give you last modified file form

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find all file which is access in given time

find -atime

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[linux_demo]mkdir demo

[linux_demo]cd jignesh

[linux_demo dir1]cat >a

this is a from jigensh dir jignesh

[linux_demo dir1]cd ..

[linux_demo]mkdir jigensh1

[linux_demo]dir jignesh

a

[linux_demo]dir jignesh1

dir: jignesh1: No such file or directory

[linux_demo]dir

jigensh1  jignesh

[linux_demo]dir jigensh1

[linux_demo]cp jignesh/a jigensh1/

[linux_demo]cd jigensh1

[mca11134@ALS jigensh1]$ dir

a

/******************************************/

[linux_demo]mkdir jigensh2

[linux_demo]dir

a  b  d  e  jigensh1  jigensh2  jignesh

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cat also just create a null file and you can you also create

like this

cat >a>b>c

file data

ctrl+d

cat c

file data

cat a

null

cat b

null

//putting the data into alerady created file

cat >b

file data

ctlr+d

cat >b

file data

dir o/p =a,b,c

to append the data into the existing file

cat >>a

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rm file1 file2 file3...

 rm second  third

rm * delete the all files

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who :- Give the list of all connected ip

who am i // prints only information about you

ls :- give th name of user with blue color

ctr+d to exit from the file during the writing

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 wc [OPTION]... [FILE]...

 -c, --bytes            print the byte counts

  -m, --chars            print the character counts

  -l, --lines            print the newline counts

  -L, --max-line-length  print the length of the longest line

  -w, --words            print the word counts

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mv -u oldfile not_avlbel_fiel

[linux_demo]dir

a  b  c  d  jignesh

[linux_demo]mv -u c e

[linux_demo]dir

a  b  d  e  jignesh

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 sort [OPTION]... [FILE]...

                sort -o destinataion form source

                 sort -o text1.txt text2.txt

find the string from the file with line no

[linux_demo]grep -e hello test2

hello

[linux_demo]grep -n -e hello test2

2:hello

[linux_demo]grep hello test2

hello

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printing the all afterward context after find the given stiring

[linux_demo]grep  -A 2  hello  test2

hello

HELLO

hellohowru

[linux_demo]grep  -w -A 2  hello  test2

hello

HELLO

hellohowru

[linux_demo]grep  -w   hello  test2

hello

[linux_demo]grep  -w -A 2  hello  test2

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search hello word form two file

[linux_demo]grep -w hello test2 test4

test2:hello

test4:hello

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skip the string which is given file

[linux_demo]grep -v this test2

hi

hello

HELLO

hellohowru

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copy file form one to another file

[linux_demo]cat >test4

[linux_demo]cat test2>>test4

[linux_demo]cat test4

hi

hello

HELLO

hellohowru

[linux_demo]cat test2

hi

hello

HELLO

hellohowru

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find the given string form all avalble files

[linux_demo]grep -w hello *

test1:hello

test2:hello

test4:hello