Trap Ctrl-C in a Bash script
How to trap Ctrl-C in a Bash script?
The piece of code:
# trap ctrl-c and call ctrl_c()
trap ctrl_c INT
function ctrl_c() {
echo
echo "Ctrl-C by user"
# do the jobs
exit
}
Similar Posts
How to SSH to Linux Hosts for Beginners
ByEric Ma
This is a simple tutorial for beginners to SSH to a Linux host. This is quite easy with the easy-to-use software freely available but the beginners need a tutorials to start with. Hence, I write this tutorial about how to ssh to a Linux host. This tutorial is for users on Windows. 1. Download a…
Understanding Temporary Forks and Reorganization in Blockchain
ByEric Ma
Temporary forks and chain reorganizations (reorgs) are natural occurrences in decentralized blockchain systems. They arise due to the asynchronous nature of block propagation across the network. While temporary forks are short-lived and resolved quickly, chain reorganization refers to the process by which the blockchain discards one branch in favor of a longer or higher-priority chain….
Which are sequence points in C?
ByEric Ma
What are sequence points in C? The comp.lang.c FAQ explains this quite well. A sequence point is a point in time at which the dust has settled and all side effects which have been seen so far are guaranteed to be complete. The sequence points listed in the C standard are: at the end of…
Why are keys overlap in SST files at Level 0 in LevelDB system?
ByEric Ma
As is known, keys may be overlap in SST files of level 0 in LevelDB. I am wondering why it needs to be overlap? An sstable is read-only after being written to the disk from a memtable. Accumulated K/Vs in the log up to a certain size are organized as a memtable and written to…
Printing a Line to STDERR and STDOUT in Python
ByEric Ma
In Python, how to print a string as a line to STDOUT? That is, the string and the newline character, nicely? And similarly, how to print the line to STDERR? In Python, to print a string str with a new line to STDOUT: print str In Python to print a line to STDERR: import sys…
HDFS stays in safe mode because of reported blocks not reaching 0.9990 of total blocks
ByEric Ma
After a node failure and restarting the HDFS, the NameNode reports: “The reported blocks 1968810 needs additional 5071 blocks to reach the threshold 0.9990 of total blocks 1975856. Safe mode will be turned off automatically.” in the log. Why this happens? And how to fix it? About why the NameNode stays in the safe mode:…