Transfer files using ssh

'scp' command to copy files and directories to the server: 

scp your_file_name login@remoteserver.com:path to copy files, 

and scp –r your_directory_name login@remoteserver.com:path to copy entire directories.

grep character count

Use grep to count the frequency of a character in a file:

grep o 'character' filename | wc -l

Difference between continue and pass in python

Pass is a "do-nothing" statement. Best used with a if-else or try-except condition

Continue means "jump to start of loop", ignoring rest of the statements in the loop

Code	Output
for r in [1,2,3]:    print(r)    continue    print(r,"\tagain")	1 2 3
for r in [1,2,3]:    print(r)    pass    print(r,"again")	1 (1, 'again') 2 (2, 'again') 3 (3, 'again')
for r in [1,2,3]:    if r%2!=0:       print(r)    else:       pass	1 3
for r in [1,2,3]:    if r%2==0:       continue    print(r) Bad coding practice according to me but nevertheless this is possible.	1 3

Allow wget to overwrite files

Default behavior of wget is to make new files if files of same name are downloaded again, appended with a counter.

wget filename > filename
wget filename > filename.1
wget filename > filename.2

To overwrite the existing file with the new downloads without creating new files, the answer is:

On GNU Wget 1.12 built on linux-gnu:

Use wget -N filename