I want to write a program to change systems ip address from dhcp/static to static only. my original file’s contents will be either this or it may be like this, Now, i want to change after [ipv4] pattern, so that after editing my file should looks like this Answer Here’s a Perl solution. It sets th…
Tag: unix
Bash – if statement not automatically operating
I’m having a very odd problem with a bash script, written on Ubuntu 17.04 machine. I have a txt file that contains information about people in this fashion: number name surname city state With these infos I have to create an organization system that works by state. For example, with a list like this 123…
How To Substitute Piped Output of Awk Command With Variable
I’m trying to take a column and pipe it through an echo command. If possible, I would like to keep it in one line or do this as efficiently as possible. While researching, I found that I have to use single quotes to expand the variable and to escape the double quotes. Here’s what I was trying: But…
Save only one string of multi-string command output
I’ve got a bash command to find the largest file in a sub-directory. I’d like to save the output to a variable to use it with other commands. bigile=$(find /path/to/directory -type f -exec du -Sh {} + | sort -rh | head -n 1) Unfortunately, this saves both the file size and the filepath. If I pass …
ls -al output column fields
Can someone guide me what does each column of ls -ali output in linux describe? Answer ls -ali something like this -a, –all do not ignore entries starting with . -i, –inode print the index number of each file inode, authority, num ,user,group, size , date file name you can use “man ls”…
C Program that makes a copy of a file using standard I/O and system calls
I am trying to write a C program which uses standard I/O and System calls to perform copying of contents of one file to another file. So far, I have done this : When I run the program like this : Assuming that one.txt is well defined, what I want is to create a new file called two.txt and copy
empty an existing array in ksh
I have script which stores the list of files in an array as shown below I have to empty this my_array variable to use it for other purpose. I cannot declare another new array. Is there any way to clear the content of the array and reuse it again? Thanks in advance. Answer Since you’re already using set …
Listing files with numeric names
How do I list files that have only numeric names e.g I have tried ls -l [0-9]* but this seems to bring all file names that start with a digit and can have anything in their name after a digit. Answer First, turn on Bash’s extglob option: Then use this pattern: Read more about extended pattern matching i…
Awk in loopwith different file
I have four files and want to run a awk code on each file. But this code is not working. My code: Answer Awk can work with multiple files no need of for syntax will be like this or In your case To correct your existing code change To
Bash: Want to move certain amount of files, that contains spaces to a different directory
So I’m quite new with bash and Stack Overflow in general, so forgive me if I may be missing something. I’ve been trying to create a script that moves a certain amount of files (ex: 3 files), that may contain spaces (like “hello world.txt”), to another directory. I’ve tried a few …