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lang-bash
tcgetattrin<termios.h>. We are a shell script, so our interface to the line count in the kernel isstty -awhich dumps out info likerows 40 cols 80. In the problem situation, this doesn't help; the value matches what's in$LINESand also jibes with the previously known value that the script knows about. I.e. the size appears to be the same, though the terminal is smaller and we lost the scroll-protected line.stty -awould reportrows 41, andLINESwas 41. While we are backgrounded due to some program running, the window is resized to 41 lines. When the program terminates, we haverows 41andLINES=41. But that's the full size of the window; the scroll-protected line is gone! We didn't get aSIGWINCH, and the sizes look the same. Oops!LINES=41and sttyrows 42. After background you hadLINES=41and sttyrows 41. 3) This change you can detect, without needing any signal.