In this following command:
awk 'BEGIN{ORS=""}1'
what does '1' signifies that comes after closing curly brace '}' of awk? I guess, it does not mean 'first occurrence' because I verified that.
And, pls tell me how to override or suppress awk's field variables like $1, $2.. by positional... (7 Replies)
Hi All,
I have 2 variables. Result1 and Result2. I want to put a condition that if Both are True then echo "All True" Else Show Error.
Right now i am doing this and getting error.
if ;
then
echo "All True"
else
echo "Failed"
fi;
Error.
line 8: '
Solution: Looking for (2 Replies)
I really don't know the meaning of these operators. Could someone explain the meanings so I can make my test for today?
<, <=, ==, !=, >=, >,
||, &&, ! ~ , !~
Thanks! (1 Reply)
Hi,
I am having the following doubts on awk. Please clarify for me.
a) What does it mean?
awk '$1=$1' and how does it change if I append FS="" to the above code?
b) What if I use awk -vFS="\n" (i.e) setting (input) field separator to newline char, then what will be the value of $0,... (6 Replies)
Hi
Lets say I have two arrays:
VAR_1 = "File_A" "File_B" "File_C" "File_D"
VAR_2 = "File_A" "File_D"
Is there a simple command to get the difference of these list, i.e.
VAR_1_2 = "File_B" "File_C"
or do I have to write a script and loop through all elements and compare them one by one?
... (1 Reply)
Hi all,
I have a variable which is having the value like below,
$ echo ${p}
8 15 22 30
$
My requirement is that the variable should return true when it contains only one number like below,
$ echo ${p}
15
$
Otherwise, it should return false if it contains more than one number.
I... (4 Replies)
Hey everyone, I'm really getting into learning C, but as I look at more advanced example code, I see things like
if (!*variable1)
blah blah blah...
and
variable2 ^= *(variable1++);
my question is, when you have a combination of two operators, like !*. The ! means 'not' and the *... (2 Replies)
Discussion started by: Lost in Cyberia
2 Replies
LEARN ABOUT LINUX
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)