07-12-2016
Without knowing what arguments you intend to pass to _exec and what output you are hoping to produce, we can only make wild guesses about what might or might not work for you.
But using echo to print arbitrary text is dangerous (especially when the operating system you're using and the environment variables in place when your script is invoked are unspecified).
Is there a limited set of commands that will be passed to your _exec function as the 1st operand, or can the user specify any command available on your system? Will your _exec function be invoked with a command and parameters in a quoted string passed as the 1st operand; or just a command name that will be executed with no parameters?
How many terabytes of output might be produced by the command given as the 1st operand to your _exec function?
Where is the variable ESHELLERR assigned a value (or are you expecting _fatal to be called with three operands instead of four)?
10 More Discussions You Might Find Interesting
1. Programming
OpenBSD complains when it sees this function in my program
/*This function takes the string "test\n" and returns the string "test\n\test\ntest\n"
ENTROPY = 1024
*/
void *build_string(int count, char **strarr)
{
int k;
char *new;;
size_t max;
if(count == 0) {
... (2 Replies)
Discussion started by: frequency8
2 Replies
2. Programming
hi
how can I return multiple values from a C function. I tried the following:
#include <stdio.h>
void foo(int id, char *first_name, char *last_name)
{
/*
this is just an example to illustrate my problem... real code makes
use of the "id" parameter.
*/
first_name = (char... (8 Replies)
Discussion started by: Andrewkl
8 Replies
3. Shell Programming and Scripting
Hi,
I have a script which does something like the below:
execute_some_script.sh $arg1 $arg2 `exec-some-cmd`
if then;
do something
else
do something else
fi
However, during some cases, there is an error saying:
line xxx: [: too many arguments
at the line number which has... (5 Replies)
Discussion started by: laloo
5 Replies
4. Shell Programming and Scripting
Hi there, I have the following output,
# raidctl -l
RAID Volume RAID RAID Disk
Volume Type Status Disk Status
------------------------------------------------------
c0t1d0 IM OK c0t1d0 OK
... (4 Replies)
Discussion started by: rethink
4 Replies
5. Shell Programming and Scripting
Hi,
I need to retrun multiple values
function errorFileCreation
{
echo "Before"
return -1 "Siva";
echo "Aftyer"
}
echo ${?} - This can be used to getting first value.
how can i get second one.
Advance Thanks...
Shiv (3 Replies)
Discussion started by: rsivasan
3 Replies
6. Programming
I know multiple values can be returned from a function in C like this:
char **read_file ( char * , unsigned long int * );//this is the function prototypeunsigned long int number_of_words = 0;//variable defined in main() and initialized to 0words_from_dictionary = read_file ( "dictionary.dit" ,... (2 Replies)
Discussion started by: shoaibjameel123
2 Replies
7. Programming
Hello,
i'm trying to implement the times() function and i'm programming in C.
I'm using the "struct tms" structure which consists of the fields:
The tms_utime structure member is the CPU time charged for the execution of user instructions of the calling process.
The tms_stime structure... (1 Reply)
Discussion started by: g_p
1 Replies
8. Shell Programming and Scripting
Hello!
I have one strange question - let's say I have a long, multiple-line string displayed on the terminal using echo, and I would like to make a carriage return to the beginning of this string, no to the beginning of the last line - is something like that possible? I would like to be able to... (1 Reply)
Discussion started by: xqwzts
1 Replies
9. Shell Programming and Scripting
I am using a for loop to copy files from say DIR1 and DIR2 to DIR3.I have to check whether files are copied from DIR1 and DIR2 and print the respective message.
@path=("$DIR1","$DIR2");
foreach (@path) {
$rc=system("cp $_/*xml $DIR3");
if ($rc == 0)
{
print "Files were copied... (1 Reply)
Discussion started by: liyakathali
1 Replies
10. Shell Programming and Scripting
Hi
I am pretty confused in returning and capturing multiple values
i have defined a function which should return values "total, difference"
i have used as
#!/usr/bin/ksh
calc()
{
total=$1+$2
echo "$total"
diff=$2-$1
echo "$diff"
}
I have invoked this function as
calc 5 8
Now i... (2 Replies)
Discussion started by: Priya Amaresh
2 Replies
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 filename 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)