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internal field separators

Internal field separator

In Unix operating systems, internal field separator (abbreviated IFS) refers to the character or characters designated as whitespace by the operating system. IFS is actually a system variable, and it can be modified, which is useful programmatically in a number of ways.

IFS typically includes the space and the newline.

Security Issues:

This field can be manipulated by a hacker to help him in fooling the O/S to run another program in SUID mode to gain root access.

http://www.tech-faq.com/suid-root-script-binary.shtml

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