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I would suggest you prefer strncat to strcat. strncat is the secure sister of strcat:



strncat - C++ Reference (http://www.cplusplus.com/reference/clibrary/cstring/strncat/)

usage of strncat...

Well, I don't know how you can do this on the IBM AIX, but since it's a commercial grade Unix system, I'm almost sure there is way you can do this. Unfortunately the solution to this problem is...

To the program work the way you expect, you need to initialize the str and str2 memory areas with the same values (say, with all zeroes, for example):


(...)
char str[20];
char str2[20];
...

You have options that range from opening directories and reading their contents manually ( opendir, readdir), searching for the files (and doing it recursively) to using more specific functions like...

If using the if bash keyword is not a must, you could use the find program to do the job:


find . \( -name "*.dat" -o -name "*.asc" \) -exec rm {} \;


or


find . \( -name "*.dat" -o ...

I think you had better dynamically allocate the memory to hold the string copy. A fixed length buffer is subject to buffer overflows. strdup(3) would do the work for you. Alternatively, you can use...

You should quote the $username variable:


user_id=`awk -v val="$username" -F: '$1==val{print $3}' /etc/passwd`

A process is running in the foreground if its process group is the same as its terminal's foreground process group.


/*
To be complete and safe, you should open /dev/tty and pass the...

Use the tee(1) program as suggested by yazu and put everything inside curly brackets if you have many commands:


{

echo hello
echo how are you?
echo i am fine

} | tee -a logfile.log

...

arr[$1]=$3


What we are doing here is creating an array, whose indexes are the contents of the first column of each line ("abc", "xyz", etc), and the values are the corresponding third element of...

I think that the following would produce the output you expect:


awk 'FILENAME == "A.txt" { arr[$1]=$3 } FILENAME == "B.txt" && arr[$1] != $3 { print $1 ,$3 - arr[$1] }' A.txt B.txt


What I...

The problem is that you can not initialize members in a structure definition.