If you often type the wrong command (or repeat the simmilar commends) under bash shell (like me), you may need to read this post:
cp file1.txt /path/to/dst cp file1.a1 /path/to/dst cp file1.a2 /path/to/dst
Substitute the first occurrence
How do I replace .txt with a1 and a2 and repeat the last command? The syntax is as follows for quick substitution and repeat the last command, replacing WORD1 with WORD2:
^WORD1^WORD2^
which is equivelent to
!!:s/WORD1/WORD2
Therefore, ^.txt^.a1 will generate the second commend above, and ^.a1^.a2 will generate the third one.
Substitute all occurrences
The above syntax substitutes only applies to the first occurrence. For example:
cp file1.txt /path/to/dst/file1.txt ^.txt^.a1 # Output: cp file1.a1 /path/to/dst/file1.txt
To repeat the last command with a substitution, use
!!:gs/WORD1/WORD2
For example:
cp file1.txt /path/to/dst/file1.txt !!:s/.txt/.a1 # Output: cp file1.a1 /path/to/dst/file1.a1