rm dekim file and wz cube

fsrm  uds:/*/*.dekim
removes dekim file

rmwz uds:/*/*
removes wz cube

Linux print sequential numbers

$seq 10 -1 0
10
9
8
7
6
5
4
3
2
1
0

       seq [OPTION]... LAST

       seq [OPTION]... FIRST LAST

       seq [OPTION]... FIRST INCREMENT LAST

Linux join every 2 lines in a file

$ cat file
USA
442
India
249
UK
50$ 

paste - - -d, < file

USA,442
India,249
UK,50

 paste - - - - -d, <input_list_before_combine.list  # join every 4 lines, each "-" is one line

$ paste - - < file

USA 442
India 249
UK 50

from http://www.theunixschool.com/2012/03/join-every-2-lines-in-file.html

Perl compare strings

You need to use 'eq' or 'ne' operator instead of  '==' or '!='

windows key to minimize/maximize the window

1. Restore Down: Windows logo key + Down Arrow
2. Minimize: Windows logo key + Down Arrow
3. Select Window: Alt+ Tab 
4. Maximize: Windows logo key + Up Arrow

awk print last 5 characters of one line

$ cat test.list | awk '{print substr($1,length($1)-4, length($1))}'

from this link
http://www.unixcl.com/2008/05/print-last-2-characters-using-awk.html

Fix "^m" at the end of line

fix line endings in vi:

:set fileformat=unix

:wq

delete content of file1 from file2

grep -v -f file1 file2 > outfile

here outfile will have data other than file1 content

For exact match, use -Fx

grep -vFx -f file1 file2 > outfile

delete empty lines from file

$ sed  '/^\s*$/d'  lineno_tape.list

sort scientific number in linux

$ sort -g file.txt

Grep

    grep smug files         {search files for lines with 'smug'}
    grep '^smug' files      {'smug' at the start of a line}
    grep 'smug$' files      {'smug' at the end of a line}
    grep '^smug$' files     {lines containing only 'smug'}
    grep '\^s' files        {lines starting with '^s', "\" escapes the ^}
    grep '[Ss]mug' files    {search for 'Smug' or 'smug'}
    grep 'B[oO][bB]' files  {search for BOB, Bob, BOb or BoB }
    grep '^$' files         {search for blank lines}
    grep '[0-9][0-9]' file  {search for pairs of numeric digits}

http://www.robelle.com/smugbook/regexpr4.txt

Nominal Fold

Nominal Fold = geophone spacing * no. geophones / 2 * shot spacing

Nominal Fold = streamer length / 2 * shot spacing

Putting Two Consecutive Lines into One Line with Perl / AWK

I have a data like below:

abcd
join abcd
efgh
join efgh

I want to join the two consecutive pair into one line. Resulting:

abcd join abcd
efgh join efgh

$ sed 'N;s/\n/ /' tst.list 

abcd join abcd
efgh join efgh

http://stackoverflow.com/questions/10220348/putting-two-consecutive-lines-into-one-line-with-perl-awk