CIDR to netmask is straightforward if tedious -- just binary math. Shells aren't generally that good at it but modern BASH has large enough numbers to handle this.
If you have an older bash, it may generate negative values due to overflowing its 32-bit integers.
please let me know that in unix using c programming language we can do binary to string conversion and vice versa using ltoa and atol but how can we do it in c++ programming language.
thank you in advance. (3 Replies)
Hello,
can sed be used to convert all letters of a file from uppercase to lowercase and vice versa?i know tr command can be used but with sed is it possible?
i came up with this :-
sed 'y///' file1
actually the above command is also not working! Please help me. Thanks in advance :) (6 Replies)
Hi,
I have a pdf file. i want to convert it to text file and do some work on it and later want to convert it back to pdf. Can this be done via unix?
or
Is there a way unix can directly work on PDF file? (2 Replies)
Hi,
I am new to Unix and discovered this example problem online that I believe will help my learning:
Run the command's below
env >> xx
env >> xx
env >> xx
env >> xx
env >> xx
You will now have a file called XX with the env redirected into it 5 times
Create a script named... (2 Replies)
i am thinking of replacing my vista with ubuntu.
Questions:
1) what will be the advantages and disadvantages of using ubuntu instead of vista?
2) what will be the setbacks of replacing my vista?
3) how hard is it to cope up with the new OS? what must i learn to utilize ubuntu? (1 Reply)
Hi
I have a system PRIMARY where I can push or pull files to/from STANDBY using scp. I can also ssh without entering a password.
On the STANDBY system if I try and use scp or ssh it asks for a password.
I checked in ~/.ssh and there was no authorized_keys file on the PRIMARY server. After... (2 Replies)
I need to write a script that will take the input from a file and convert the number from centigrade to fahrenheit and vice versa.
This is what I have but it doesn't seem to be correct.
Also the data file has 11 numbers inside of it and the output needs to be listed as so:
Fahrenheit Temperature... (18 Replies)
Hi all,
I installed Oracle virtual box 4.1.8 on my desktop. I installed Windows 2008 server R2 as one instance and Solaris 10 as another instance. When am trying to ping from Windows to solaris and vice-versa, ping not working.
windows IP : 10.1.47.24
Solaris IP : 10.1.47.25
netstat... (2 Replies)
Hi,
In unix or linux is there any command exist to identify Host Name to IP Address or Vice Versa?
Thanks in advance (6 Replies)
Discussion started by: nag_sathi
6 Replies
LEARN ABOUT DEBIAN
rbash
RBASH(1) General Commands Manual RBASH(1)NAME
rbash - restricted bash, see bash(1)RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a file name containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO bash(1)GNU Bash-4.0 2004 Apr 20 RBASH(1)