Linux Shell Basic2 Cat Find TR

Cat stands for concatenate.

Case 1.

When the text files has more blank lines, we want to remove them.

We can use Regex \s+ ' \ n '.

Cat File.txt | TR \s ' \ n '

Cat-t file.txt # Show Tabs as ^.

Cat-n file.txt # Show line numbers

. Specifies current directory and. Specifies the parent directory. This convention is followed throughout the Unix file system.

find . -iname "*.txt"

I means ignore the case.

Find. \ (-name "*.txt"-o-name "*.pdf" \)-print

./text.pdf

./new.txt

Find. -iregex ". *\ (\.py\|\.sh\) $"

./test.py

./new. PY

Find. ! -name "*.txt"-print

Files not end with. txt.

Find. -maxdepth 1-type F-print

Just show file and not traverse the sub folder.

Find. -type D

Just Show the Directory

Type:

F:file

D:directory

L:link

Print all the files that were accessed within the last 7 days as follows:

$ find. -type f-atime-7-print

Atime:access time

Mtiem:modify time

-ctime:change time

n order to print all the files that is have access time older than seven minutes, use the

Following command:

$ find. -type F-amin +7-print

For example, find all the files that is have a modification time greater than that the

Modification time of a given file.txtfile as follows:

$ find. -type F-newer File.txt-print

Search based on file size

Based on the file sizes of the files, a search can be performed as follows:

$ find. -type f-size +2k

# Files have a size greater than 2 kilobytes

Instead of Kwe can use different size units as the following:

b–512 byte blocks

C–bytes

W–two byte words

K–kilobyte

M–megabyte

G–gigabyte

Find. -type f-name "*.C"-exec cat {} \; >all_c_files.txt

$ cat Example.txt # example file

1 2 3 4 5 6

7 8 9 10

11 12

$ Cat Example.txt | Xargs

1 2 3 4 5 6 7 8 9 10 11 12

$ Cat Example.txt | Xargs-n 3

1 2 3

4 5 6

7 8 9

10 11 12

echo "Hello Linux" | Tr ' A-Z ' A-Z

HELLO LINUX

echo "Hello 123 World 456" | TR- D ' 0-9 '

Hello World

echo Hello 1 char 2 next 4 | TR -d-c ' 0-9 \ n '

1 2 4

echo "I am your friends?" | Tr-s "

I am your friends?

Find-type F | Xargs md5sum

e8bc686b2c380b9ad56c024a03384150./sub/java.txt

a5bf231497e5d503172bfd39a387b197./all_txt_files.txt

e827b6437257f24b9e5fbba44fd98f5c./num.txt

B6d9275e7e16b154059677fac91baa79./test.txt

B6d9275e7e16b154059677fac91baa79./mul_bank.txt

sort -r:sort in reverse order

split can used to split file to specify size.

Linux Shell Basic2 Cat Find TR