Common operations built into Linux shell strings (get length, find, replace)

String-related operations are often involved in writing shell programs. There are many command statements, such as awk,sed , that are capable of doing string operations. In fact, the shell built a series of symbols to achieve similar effects, using internal operators will omit the start of external programs and other time, so the speed will be very fast. If the built-in operator is able to do this, use the built-in precedence.

1 Inference Read String value

Common operations built into Linux shell strings (get length, find, replace)