0
votes
1answer
23 views

removing the last line of a file not working? [duplicate]

I have this TXT file that is created by a bash script and at the end I want to remove the last line of that file that is an empty one. head --lines=-1 r3.txt > r4.txt sed '$d' r3.txt > r4.txt ...
14
votes
8answers
6k views

Command to display first few and last few lines of a file

I have a file with many rows, and each row has a timestamp at the starting, like [Thread-3] (21/09/12 06:17:38:672) logged message from code..... So, I frequently check 2 things from this log file. ...
15
votes
4answers
14k views

cat line X to line Y on a huge file

Say I have a huge text file (>2GB) and I just want to cat the lines X to Y (e.g. 57890000 to 57890010). From what I understand I can do this by piping head into tail or viceversa, i.e. head -A ...
5
votes
2answers
890 views

Why does `cat`ing a file into itself erase it? [duplicate]

Possible Duplicate: IO redirection and the head command I just wanted to remove all but the first line of a file. I did this: head -1 foo.txt ... and verified that I saw only the first ...