09-19-2013
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10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I am trying to assign a awk array for further processing later in the script. I can't seem to figure it out. If someone could look at this and help me, I would very much appreciate it.
Thanks in Advance.
for ( x = 1 ; x <= Var ; x++ ) {
if ( x in varr ) {
... (2 Replies)
Discussion started by: timj123
2 Replies
2. Shell Programming and Scripting
Hi,
i want awk to read a file and place it's content into two arrays. When trying to read these arrays with a "for a in ${source_path} "-Loop it gives the right result. But when trying to access directly (/bin/echo ${source_path}) it doesn't work.
I read "all "the awk threads in this forum and... (6 Replies)
Discussion started by: bateman23
6 Replies
3. Shell Programming and Scripting
Is there a way to retain the awk array in the shell.
My requirement
file a.txt
A B Count
10 1 25
10 2 20
10 3 21
11 1 20
11 2 22
12 2 40
12 3 15
A and B are my variables and count... (6 Replies)
Discussion started by: jagpreetc
6 Replies
4. Shell Programming and Scripting
I want to ask the user to enter an X amount of file names. I want to put those names into an array and then loop back through them to verify they are in the directory. 1st- How would I assign the value to an array and what is the correct syntax. 2nd- how would i reference that array after I... (3 Replies)
Discussion started by: tvb2727
3 Replies
5. Shell Programming and Scripting
file.txt : is delimiter:
abc:def:ghi
jkl:mno: pqr
123:456:789
if I do the cut command, and cut the first column, and echo it out
I will get the output:
abc
jkl
123
How can I assign the column of text that I've cut into Array?
e.g If I were to echo array array it will output as:... (9 Replies)
Discussion started by: andylbh
9 Replies
6. Shell Programming and Scripting
Hi,
I have a piece of code as follows:
i=0
while read LINE
do
var = "$LINE"
i=$((i+1))
echo "${var}"
done < file
I want to assign value to the array var.
However, when i execute the script i get a error.
Please can you help me know what i am missing.
I ultimately want to... (2 Replies)
Discussion started by: sunrexstar
2 Replies
7. Shell Programming and Scripting
Hi all ,
I have a string like para1#para2#para3
i want to assign para1 as first element para2 as second and so on
i tried
IFS=#
set -A array para1#para2#para3
echo ${array}
para1 para2 para3
i want echo ${array}
para1 (2 Replies)
Discussion started by: max_hammer
2 Replies
8. Shell Programming and Scripting
Hi to all,
I have this input:
<group>
<x "2">Group D</x>
<x "3">Group B</x>
<x "1">Group A</x>
</group>
<group>
<x "1">Group E</x>
<x "0">Group B</x>
<x "1">Group C</x>
</group>
<group> ... (11 Replies)
Discussion started by: Ophiuchus
11 Replies
9. Shell Programming and Scripting
With this script i want to print the output to a specific field-number . Can anybody help?
awk 'NR=FNR{split(FILENAME,fn,"_");nr=$2;f = $1} END{for (i=1;i<=f;i++) print i,$fn=nr}' input_5.csv input_6.csvinput_5.csv
4 135
5 185
6 85
11 30input_6.csv
1 90
3 58
4 135
7 60
8 55
10... (1 Reply)
Discussion started by: sdf
1 Replies
10. Shell Programming and Scripting
Hi,
I have a 10*10 two dimensional array. How do I assign value to all it's 100 elements at once? I don't want to open two for loops and assign one by one.
Thanks,
Shuri (1 Reply)
Discussion started by: shurimano
1 Replies
LEARN ABOUT REDHAT
system
SYSTEM(3) Linux Programmer's Manual SYSTEM(3)
NAME
system - execute a shell command
SYNOPSIS
#include <stdlib.h>
int system(const char *string);
DESCRIPTION
system() executes a command specified in string by calling /bin/sh -c string, and returns after the command has been completed. During
execution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored.
RETURN VALUE
The value returned is -1 on error (e.g. fork failed), and the return status of the command otherwise. This latter return status is in the
format specified in wait(2). Thus, the exit code of the command will be WEXITSTATUS(status). In case /bin/sh could not be executed, the
exit status will be that of a command that does exit(127).
If the value of string is NULL, system() returns nonzero if the shell is available, and zero if not.
system() does not affect the wait status of any other children.
CONFORMING TO
ANSI C, POSIX.2, BSD 4.3
NOTES
As mentioned, system() ignores SIGINT and SIGQUIT. This may make programs that call it from a loop uninterruptable, unless they take care
themselves to check the exit status of the child. E.g.
while(something) {
int ret = system("foo");
if (WIFSIGNALED(ret) &&
(WTERMSIG(ret) == SIGINT || WTERMSIG(ret) == SIGQUIT))
break;
}
Do not use system() from a program with suid or sgid privileges, because strange values for some environment variables might be used to
subvert system integrity. Use the exec(3) family of functions instead, but not execlp(3) or execvp(3). system() will not, in fact, work
properly from programs with suid or sgid privileges on systems on which /bin/sh is bash version 2, since bash 2 drops privileges on
startup. (Debian uses a modified bash which does not do this when invoked as sh.)
The check for the availability of /bin/sh is not actually performed; it is always assumed to be available. ISO C specifies the check, but
POSIX.2 specifies that the return shall always be non-zero, since a system without the shell is not conforming, and it is this that is
implemented.
It is possible for the shell command to return 127, so that code is not a sure indication that the execve() call failed.
SEE ALSO
sh(1), signal(2), wait(2), exec(3)
2001-09-23 SYSTEM(3)