Count the number of ‘|’ in a file per line.
sed 's/[^|]//g' test.csv | awk '{ print length }'
Print the lines with line number which do not contain ’67’
grep -n -v 67 number_of_pipes.txt
Print line 929064 of file ‘test.txt’
sed '929064q;d' test.txt
Open file ‘test.txt’ in line 929064 with vi
vi +929064 test.txt
The first day of the month two months ago in SQL
select add_months(from_unixtime(unix_timestamp(),'YYYY-MM-01'),-2)
