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hello,everyone,I'm reading LDD3.Topics about oops,it said the code bellow would cause a fault condition because "this method copies a string to a local variable,unfortunately,the string is longer...

Thanks,ahamed!You're right, I optimized the script and fixed the problem temporarily.

Hi,all.Well,I know someone has already asked this question before,however,It's too long before.So i post a new thread here.
Here is the issue.I have a shell script that use awk to calculate...

Are the two timestamps in one same day?You can convert from time string to seconds(starts from 1970/1/1) by date,such as

val1=`date --date="12:02:45" +%s`
val2=`date --date="08:30:00" +%s`
[...

try this,"file" is the input file
sed 's/\(.\)/\1 /g' file | awk '{a=$1||$3;b=$2||$4;printf "%d%d(binary)=%d(decimal)\n",a,b,a*2+b}'

if you want to put more than one command in such a command style,you should use brace curly---{},NOT ().The latter means execute these commands in a subshell.Look:

[ true ] && ( echo "yes,you can...

I can't understand what you mean.

you should quota the second parameter of mv,you see,if you have a file named "name with blanks",the shell will expand the blanks within variables without double quotas or single quotas or backslash....

mv $a "`echo $a | sed 's/_/\\ /g'`"
there is a white space after you replace the "_",the shell will expand that into two strings.

could you post your complete code?

clearly,you need to install wget,if you use ubuntu,you can install it by
sudo apt-get install wget
Installation's similarly in other distributions.

try this

wget https://www.unix.com/shell-programming-scripting/155750-use-sed.html#post302503291 > newfile.txt

first,you should know the time you want to compare is "modify time","access time" or "changed time".Command "find" gives some options to do things like that.

do you means your script will delete "are" and "hare" when you only want to delete "are"?
try the "\b" anchor,it match a whole word which is between two \b.
sed 's/\bABC\b//' will delete the...

try
read command
exec $command

-eq and others like that are used to compare two numeric variables,if you wanna compare two strings,use "=" and "!="

yeah,sometimes it won't work by adding sync(),such as with my platform and my compiler version,as i said above,mingw works fine.Your solution is a good way to handle this problem.But i'm wondering is...

yes,i think your solution is same as adding cin.sync().

Hello,
Im using the g++(g++ Ubuntu/Linaro 4.4.4-14ubuntu5 4.4.5) and im trying to compile a small snippet code and got into an endless loop.I recompiled that in VS2010 under Windows 7 and the...

No,it not a function,have you ever learned C?like the while statement.However,the {} is a un-named code blocks here.It just reunion some codes into a space(a local space).One important usage is to...

man the "grep",i think the option -v and -f are what you're looking for.

the {} defined a namespace,or say code blocks.It groups the codes inside it as a unit.so all output of the code within {} will be redirected to a pipe.

the option named "-newer" of find maybe suitable for you,try man find

There're many way to achieve that,here is a intuitive way to do that,redirect the output to a pipe,then replace all "newline" with ",",then use another pipeline to remove the restore the last...

Thanks all of you,you guys are so kind!!And i love this forum more because of you guys!