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i have deleted it when i was working in root now if want to get it again how it is possible i already used cp command to copy it from etc directory but it is not working

code
#!/bin/sh
echo enter file name
read f
echo enter number of such files
read n
i=1
while test $i -ne $n
do
echo $f$i >> outfile
cat $f$i >> outfile
i=`expr $i + 1`
done

...

hai friends i have deleted passwd command using rm command i thought it will come again at the time of rebooting but it is completely deleted how to get it worked again

thank you for your reply and really i am new to shell programming and i feel doubt that the administrator may treat my problems as home work problems and he may block them .so can any one suggest...

code please

How To Find The Number Of Programs That A User Running ON A GIVEN TERMINAL