Question

In Linux please just type out command assuming files and directories are there

Q21: display those line and line number do not contain “apple” from files whose name contains “file”.

Q22: find all files, where file size is bigger than 100k and smaller 500k, and where filename ends with “.py”

Q23: delete all directories with size larger than 10M or smaller than 1M.

Q24: find out the five largest files or directories from current working directory, and output the result to “Top5sortedlist.txt”.

Q25: Extract between 10th to 20th character from “table1.txt”, and append result to “table2.txt”.

Answer 1

(Ans 1)

ls | grep "file" | xargs grep -vn apple
#line and line number which does not contain "apple"

(Ans 2)

find -iname "*.py" -size +0.1M -size -0.5M
#finding python files of the given size range

(Ans 3)

find . -type 'd' -size +10M -size -1M -delete
#delete all directories in the given size range

(Ans 4)

du -a | sort -n -r | head -n 5 | cut -f2 > Top5sortedlist.txt
#find the five largest files or directories from current working directory and output redirect to a file

(Ans 5)

cut -c10-20 < table1.txt >> table2.txt #cut is used to cut the required set of characters out.
#the >> operator appends the result to table2.txt