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Old 07-07-2003, 05:12 PM   #1
Registered: Apr 2003
Posts: 178

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Bug in C code

root:~# gcc -o test2 test2.c
root:~# ./test2
sh: -c: line 3: syntax error: unexpected end of file

#include <stdio.h>

system("for i in `cat /etc/samba/smbpasswd|awk '{split($0,a,\":\"); "
"if ((substr(a[1],1,1)!=\"#\") && (a[1]!=\"admin\")) print a[1]}'` "
"do "
"echo -n -e \"SMBUser\t\t\t$i\t\t\"`du -ks /home/$i | "
"awk '{print (($1*1024)/1000000)}'`\"\n\" "
Old 07-07-2003, 05:53 PM   #2
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Registered: Jan 2003
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You can't concatenate strings like that. You will have to put all of the commands into a single string.

man strcat

Also, it looks like you're trying to simulate hitting the "enter" key by ending the string. The shell/system call doesn't care about newlines; it ignores them. They're only provided as a means to make it more readable to people. To see what I mean, type out that sequence of commands like you would normally do at the command prompt. Execute it, and then hit the up arrow. Bash prints out the command all on a single line. That is what you will need to make your string look like when you feed it to the system command.
Old 07-07-2003, 05:59 PM   #3
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Location: Lancaster, England
Distribution: Debian Etch, OS X 10.4
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why cant you concatenate strings like that? thats the way to continue strings over more than 1 line in C. the error i think is in the shell commands, instead of calling system print out the string and see of it prints what you actually mean to execute.
Old 07-07-2003, 06:06 PM   #4
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Registered: Jan 2003
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You're probably right kev. I just don't do it that way. I get "set in my ways" and if I see something that doesn't fit my coding style, I get antsy...

I'll go back into my little corner now...


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