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I was working on the cs50 IDE and noticed this happen a couple of time - Snapshot of the Terminal

As you can see in the last terminal in the last entry the substitution changed to subst i don't know why. This happens mainly when I use the arrow keys to go back in the command history and also I wished to go back to an earlier command however there was no command like the one there in the last command line argument. I don't know what's going wrong

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It happens some times. It is still in the substitution directory. If you are not sure then type cd in the terminal and then type cd pset2/substitution in the terminal.

If this helps please check the tickmark.

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