Why command does not get removed even removing its binary ?

[swapnil kamble]

Hi,
I made an application in GTK+ . I created its binariy . Copied it to /bin which will create my own command , which also mean that command gets executed from path /bin . And as and when I removed binary from /bin command gets vanished that`s fine . But if I want to delete built in command then I removed its binary from same path /bin and command remains still there perfectly working .
For example ,
#rm /bin/ls
#ls
home bin var tmp usr ....

To more fun to it if I removed all code and pasted code of other file it works as other command
For example
#vi /bin/ls
then remove all line of binary code
#vi /bin/pwd
then copy all binary code of pwd
again
#vi /bin/ls
paste copied code
now command ls will act as pwd

How it is possible ?

...Swapnil



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[Bharathi Subramanian]

Post by swapnil kamble
#rm /bin/ls

What is the output of below command, after the above command ?

# which ls
# whereis ls

Post by swapnil kamble
#ls
home bin var tmp usr ....

Bye :)
--
Bharathi S



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[Navtej Singh]

This should clarify it a bit.

localhost ~ # which ls
/usr/bin/ls
localhost ~ # mv `which ls` `which ls`2
localhost ~ # ls
845patch I_Hate_Myself_For_Loving_You.mp3
localhost ~ # which ls
/bin/ls
localhost ~ # mv `which ls` `which ls`2
localhost ~ # ls
/bin/ls: No such file or directory
localhost ~ # ls2
845patch I_Hate_Myself_For_Loving_You.mp3
localhost ~ # which ls2
/bin/ls2
localhost ~ # mv `which ls2` /bin/ls
localhost ~ # ls
845patch I_Hate_Myself_For_Loving_You.mp3
localhost ~ # which ls
/bin/ls
localhost ~ # ls2
/bin/ls2: No such file or directory
localhost ~ # ls -l /usr/bin/ls2
lr-xr-xr-x 1 root root 7 Dec 7 21:51 /usr/bin/ls2 -> /bin/ls
localhost ~ # mv /usr/bin/ls2 /usr/bin/ls
localhost ~ # which ls
/usr/bin/ls

so basically the fun doesnt works for me. removing /bin/ls for me
**removed** it and no ls was available.
use which command to find where ur binary is and if it is symlink.

//N

Post by swapnil kamble
Hi,
I made an application in GTK+ . I created its binariy . Copied it to
/bin which will create my own command , which also mean that command gets
executed from path /bin . And as and when I removed binary from /bin command
gets vanished that`s fine . But if I want to delete built in command then I
removed its binary from same path /bin and command remains still there
perfectly working .
For example ,
#rm /bin/ls
#ls
home bin var tmp usr ....
To more fun to it if I removed all code and pasted code of other
file it works as other command
For example
#vi /bin/ls
then remove all line of binary code
#vi /bin/pwd
then copy all binary code of pwd
again
#vi /bin/ls
paste copied code
now command ls will act as pwd
How it is possible ?
...Swapnil
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