For some reason (probably a typo) I’ve missed an important character in an example I gave here, but I have just recently fixed it. Anyhow, to clarify this, here is the extended description of the correction. The $IFS Bash system variable defines what is the default separator between strings. Changing it can help when dealing…
First and unrelated – this is my birthday. It reminds me that another year passed, and generally speaking, I do not take this too well… Due to massive SPAM attacks, my commenting system is turned off for a while now, and I need to see how I can re-enable it safely. Bash – here we…
This was a tricky action. Assume I have a list of variables, obtained by an external source: var1=a var2=b var3=c I cannot use loop and in it the phrase ${var$i} (where i is the integer counter). It just doesn’t work. I used this instead to assign the values to an array: var[$i]=$(eval echo "${var${i}}") That…
Let’s assume we have a file containing lines such as this: first last one two three four five If we write a simple script to deal with each line in a turn, we would write something like this: for i in `cat file`; do echo $i; done This would echo, however, each word at its…
Nowadays, when LVM2 is common and is actually the default in installation of RedHat based distributions, using its snapshot capabilities can save lots of grief when files are deleted or when you need to revert to a day in the past – both for your files and for your MySQL DB. I have created a…
I always forget, and this blog is meant to help me remember. Found in Tar’s manual, are these simple directives: Have a file called file.tar, do: tar -xf file.tar full/path/without/trailing/slashes It can be a file or directory. You can have a list of files, such: tar -xf file.tar home/me home/you home/us/important-file Should do the trick.
