Operations notes

Reverse lines in a file

tac /path/to/file

In vim, you can select the lines you need to reverse and issue :'<,'>!tac.

Source: https://stackoverflow.com/a/742485/526189

Compare two files and get only the difference

# Using the `diff` tool
diff -a --suppress-common-lines -y a.txt b.txt > c.txt

# Using the `comm` tool
comm -2 -3 <(sort a.txt) <(sort b.txt)

Source: https://stackoverflow.com/questions/4544709.

Prepend data to a file

sed -i -e "1i <your data goes here>" FILE_NAME

Have rsync print timestamps

Use the --out-format option. For example:

rsync --out-format='%t %f' -avzu ~/myfolder/ user@1.1.1.1:/home/user/myfolder

Source: https://askubuntu.com/a/652532/118883


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