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How do I prompt for Yes/No/Cancel input in a Linux shell script?
...nd most widely available method to get user input at a shell prompt is the read command. The best way to illustrate its use is a simple demonstration:
while true; do
read -p "Do you wish to install this program?" yn
case $yn in
[Yy]* ) make install; break;;
[Nn]* ) exit;;
...
How to kill a child process after a given timeout in Bash?
...ut (sudo apt-get install timeout) and use it like: (most Systems have it already installed otherwise use sudo apt-get install coreutils)
timeout 10 ping www.goooooogle.com
If you don't want to download something, do what timeout does internally:
( cmdpid=$BASHPID; (sleep 10; kill $cmdpid) & ...
How to read a local text file?
I’m trying to write a simple text file reader by creating a function that takes in the file’s path and converts each line of text into a char array, but it’s not working.
...
process.waitFor() never returns
...
One common reason is that the process produces some output and you don't read from the appropriate streams. This means that the process is blocked as soon as the buffer is full and waits for your process to continue reading. Your process in turn waits for the other process to finish (which it won'...
What is “with (nolock)” in SQL Server?
...
WITH (NOLOCK) is the equivalent of using READ UNCOMMITED as a transaction isolation level. So, you stand the risk of reading an uncommitted row that is subsequently rolled back, i.e. data that never made it into the database. So, while it can prevent reads being dea...
Difference between volatile and synchronized in Java
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It's important to understand that there are two aspects to thread safety.
execution control, and
memory visibility
The first has to do with controlling when code executes (including the order in which instructions are executed) and whether it can execute concurrently, and the sec...
Where in memory are my variables stored in C?
...ory which contains the frequently executed code.
The code segment is often read-only to avoid risk of getting overridden by programming bugs like buffer-overflow, etc.
The code segment does not contain program variables like local variable (also called as automatic variables in C), global variables,...
Replace string within file contents
...f you'd like to replace the strings in the same file, you probably have to read its contents into a local variable, close it, and re-open it for writing:
I am using the with statement in this example, which closes the file after the with block is terminated - either normally when the last command f...
Difference between local and global indexes in DynamoDB
... table. When you query records via the local index, the operation consumes read capacity units from the table. When you perform a write operation (create, update, delete) in a table that has a local index, there will be two write operations, one for the table another for the index. Both operations w...
Reading my own Jar's Manifest
I need to read the Manifest file, which delivered my class, but when I use:
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