Jump to navigation. It's easy to detect when a shell script starts, but it's not always easy to know when it stops. A script might end normally, just as its author intends it to end, but it could also fail due to an unexpected fatal error. Sometimes it's beneficial to preserve the remnants of whatever was in progress when a script failed, and other times it's inconvenient. Either way, detecting the end of a script and reacting to it in some pre-calculated manner is why the Bash trap directive exists.
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ksh - Unix, Linux Command - Tutorialspoint
To make a ksh script which is a ksh program crate a new file with a starting line like:! The shell from which you are starting the script will find this line and and hand the whole script over to to ksh. Without this line the script would be interpreted by the same typ of shell as the one, from which it was started. But since the syntax is different for all shells, it is necessary to define the shell with that line.
ksh - Unix, Linux Command
Temporary files are frequently used in shell scripts. In a typical shell script often some data is processed, and the results are written to a scratch file, the new data is processed in another way, and eventually the scratch file is removed. So why write an article about this topic?
A signal is a message that some abnormal event has taken place or a message requesting another process do something. The signal is sent from one process to another process. Typically, a process sends a signal to one of its own subprocesses.