Question

Unix is known for three primary strengths. Primarily finding files, transforming things i.e. text, and managing things i.e. disk space. Provide a brief example of each strength. Also, identify which Unix strength could be used the most in your career field.

Please answer for this question ASAP.

Answer 1

Done. Please have a look and if you want to change something or dont understand something leave a comment

Unix strength:

1 Find Files:

Unix provides lot of options to find files. Basic find command is like :

find (file location) [-options] (which file to find)

There are multiple options which can be used depending upon search condition. Eg.

find . -name test1.txt

above command looks for a file name i.e. test1.txt in the current directory.

Or

find . -mtime 2

above command means list all the files in the current directory that are modified in last 2 days

We can even search inside the file as well. For instance if we are look in the log files to find a particular type of exception e.g RunTimeException:

find ./ Tomcat9.0/logs -name “*.log” -print | xrags grep “RunTimeException”

2. SED command

SED is stream Editor command that is very powerful and can perform lot of operation and file manipulation like replace strings in file and insert and delete things. It also provides option for filtering the results also. What makes SED more powerful is support for Regular expressions. SED reads an input stream , performs operation and then prints the results. It provides lots of options like:

‘s’ is for substitutes a string with another but only for first occurrence but if we want to replace all the instances of one word by another we should use ‘g’ option instead

sed ‘g/me/you/’ test1.txt

Above will replace all the instances of “me” with “you”in test1.txt .

We can also replace the text in some particular line of the file as well or even can mention the range for changing words. Eg.

sed ‘1 10 s/me/you/’ test1.txt

will replace “me” with “you” only from line 1 to 10.

3. To manage Disk space:

du command is used to managing disk space. We can analyse disk space usage by command

du -S /*

du -a -h /home/user/unix

will print all the files in /home/user/unix directory with their space usage in human readable form

which specify disk space used by all the files and directories

And df command can be used to show disk space used by files and also how much space is available.

In addition to Find and sed other command which is very frequently in career field are grep and diff, ls

Grep: which is used for searching a text string in a file. You can make case insensitive search

grep -i “Unix” test.txt

will do case insensitive search for word “unix” in file test.txt

diff Another important command is diff which can be used to compare two files. E.g

diff test1.txt test2.txt

ls is used for displaying information about all the files in the current directoty

ls -la .

list all the files in the current directory