Can anyone please explain the output of ls -1 in Linux? [closed] - linux

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I was asked this question in one of the interviews.
Can anyone please explain

ls -1 will list files each on separate line...
whereas ls itself will list them like so

ls -l shows all files or directories, with their respectives names, sizes, last date and hour of modification, and also all permitions for them.
while ls -1 will list files each on separate line

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How do I create this set of multiple files with one command? [closed]

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Given the following sets:
Set 1:
abc_data_y1
abc_data_y2
abc_text_y1
abc_text_y2
Set 2:
xyz_data_y1
xyz_data_y2
xyz_text_y1
xyz_text_y2
Can I create all 8 files (in the 2 sets) with ONE command?
If not, can I use ONE command per set to create all 8 files?
Thank you in advance.
In shells that support brace expansion (e.g. bash), you can make it shorter by
touch {abc,xyz}_{data,text}_y{1,2}
If you only want to create blank files and then edit them you can create them in one command using touch from the command line.
touch abc_data_y1 abc_data_y2 abc_text_y1 abc_text_y2 xyz_data_y1 xyz_data_y2 xyz_text_y1 xyz_text_y2

Delete specific lines using sed in multiple files [closed]

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I was wondering how to delete the first 196 lines of multiple html documents with sed.
The directory structure I have goes as follows:
find /rootdir/ -name index.html -exec sed -i '1,196d' {} \;

How do I list files between two time stamps in a certain directory? (SunOS) [closed]

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i.e.
List any files between 2014-01-25 1300 - 2014-01-25 2000 in
Cheers
You can use the find command with multiple selectors - e.g. find . -mtime +1 -mtime -3. It can be used with ctime, atime, etc., as well.
Assuming you have a GNU find (which you could compile on SunOS if you don't have it), use the age range options for find

Trim a file using tail in linux [closed]

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How do I reduce the size of a file using tail?
I just need the last 1000 lines of the file. I need the trimmed file name to remain the same.
tail -1000 file.txt
To make a new file
tail -1000 file.txt > newfile.txt

How to Remove a matched line inside a file? [closed]

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I need a shell script that should remove the matched pattern .
Can anyone please help me ?
The command is
sed -i -e '/yourpattern/d' your_file

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