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I am not satisfied that this is not homework.

Please do not post classroom or homework problems in the main forums. Homework and coursework questions can only be posted in this forum...

#include <stdio.h>

int main(void)
{
char buf[512];
int a, b, c, d;

FILE *fp=popen("/sbin/ifconfig eth0", "r");

if(fp == NULL) return(1);

...

you need:
myfile.getline(number,25); and atoi().

Do not post classroom or homework problems in the main forums. Homework and coursework questions can only be posted in this forum (https://www.unix.com/homework-coursework-questions/) under special...

change your code to
read file
touch $fileIf file is already present how you can make new file with same file name.
You should decide either you want create new file or append data into old file.
...

I have tested it below
# ./test.sh
aaaa
./test.sh: line 2: -e: command not found
NO SUCH FILE
# vi test.sh
# ./test.sh
asdfa
NO SUCH FILE
# cat test.sh
read file
if [ -e "$file" ]
then...

it should work..
Please check..

$ cat file2
read file
if [[ -e "$file" ]]
then
echo "asfsafafa"
else
echo "NO SUCH FILE"
fi$ sh file2
file
asfsafafa

$ sh file2
no_file
NO SUCH FILE...

The following need to be modified.
if (-e "$file") ==> if [ -e $file ]

Cheers,

Please use code tags for code and data sample.

I don't think so..

How come sed -e 's/console/raw/g' will replace pradeep with rawat..???:confused:

for multiple simultaneous substitution...

Please use code tags.
Also, please use more descriptive titles for your threads.

I see neither pradeep nor rawat in the script. Please copy/paste intelligently.

May be you need this:
sed -e...

Trying to read from an illegal memory location will cause this fault. i.e.