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unix Delete the second character from every line in a file Delete the last word from...

unix

  1. Delete the second character from every line in a file
  2. Delete the last word from every line in a file.
  3. Swap the first and second letter of every line in a file.
  4. Swap the first and last characters of every line in a file.
  5. For each line that begins with a single space, replace the space with a tab. Lines that begin with 2 or more spaces should not be effected.
  6. Finds dates in the form mm/dd/yy and replaces them with the form mm/dd/20yy. In other words puts 20 in front of a 2 digit year. 4 digit years should not be changed.
  7. Move lines 3 through 5 after line 8 (so the output lines would be in order 1,2,6,7,8,3,4,5,9,10,....)
  8. Given a line with a UNIX path specified, print the base file name only. So for example, "/home/users/james" would print "james"
  9. Given a line with a UNIX path specified, print the directory part only. So for example, "/home/users/james" would print "home/users"

Solutions

Expert Solution

Hi there, if you need any further guidance and having any issues while executing commands do comment, I'll be happy to help you.

I have solved first 5 problems as per time limit, you post again the rest questions.

if you like my solution do cleave a positive feedback and a thumbs up.

commands

  1. Delete the second character from every line in a file

  

sed 's/.//2' sample

sample is your file name

2.Delete the last word from every line in a file.

sed s/'\w*$'// old.txt > new.txt

\w* matches the last word inside of the file and $ anchors the search to the end of the line.

The reason that old.txt is coming out as new.txt is likely because your regular expression ^*\n is not matching any lines in old.txt.

  

3. Swap the first and second letter of every line in a file.

sed -e "s/\([^ ]*\) *\([^ ]*\)/\2 \1 /g" file

4. Swap the first and last characters of every line in a file.

sed -E 's/(.)(.+)(.)/\3\2\1/' input.txt

5.For each line that begins with a single space, replace the space with a tab. Lines that begin with 2 or more spaces should not be effected.

sed 's/^  */\t/' < file.in > file.out

or,

sed 's/ /'$'\t''/' filename

venereology answered 4 months ago
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