Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Re^2: Good-bye Unix filter idiom

by martin (Pilgrim)
on Sep 07, 2012 at 08:40 UTC ( #992267=note: print w/ replies, xml ) Need Help??


in reply to Re: Good-bye Unix filter idiom
in thread Good-bye Unix filter idiom

Quoth BrowserUk,

I don't get this. You (or someone) is using a "unix filter" perl script at the command line. You are concerned that you (or they) might accidentally (or maliciously) type a dangerous command in place of a filename as input to that script. What is to stop you (or they) from entering that command directly into the command prompt you (or they) are using?

The program might run with other privileges than those of the user. This is a fairly common scenario, and the "Unix-like filter program" pattern is intended to fit into it.

Writing to standard output, e.g., is also part of the strategy to avoid overwriting arbitrary files. If the user employs redirection to write the output to a file, this file will be (or fail to be) created according to the user's privileges. Conversely, if the user just told the program where to put the output, the program would have to worry about doing this safely. This would add complexity.


Comment on Re^2: Good-bye Unix filter idiom

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://992267]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (4)
As of 2014-09-21 01:37 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How do you remember the number of days in each month?











    Results (165 votes), past polls