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thank you very much,both of you!

thank you very much!!!
ah!i think i've seen this command again but instead of '2s' was "1.5s"
is this possible?

ok..i got it...'3d' in sed means delete the third line....and i thank you for this..
if i had sed in this form what this could mean:
sed '2s/home/george/' filename
whats the meaning of the '2s'??

maybe the command
sed '3d' filename
if i write it somewhere in my script replaces the sting '3d' withe the contents of the filename?

ok i got this about the tr command...
but what about the first command with sed and the second with sort?can you explain me these please?

Hi!
i'd like from someone to explain me 'what is what' from these parts of code if it's possible.i'd like to understand them and their usage:
1)
sed '3d' filename

2)
sort –t: +0 -1 /etc/passwd...