Use for questions related to "seq", a command-line tool to print sequences of numbers.
seq is a command-line tool, available for example in the GNU core utilities which is used to print a sequence of numbers. The start value, end value, increment and separator character can be chosen via command-line arguments.
Its original use stems from the time when shells had no other possibility to iterate over a range of numbers in a for loop; it would then be used in constructs such as
for i in $(seq 1 10); do .... ; done
However, since this creates a list of all numbers to iterate over in advance and is therefore rather inefficient, it has become somewhat obsolete with the advent of shells that provide C-style loop syntax with on-the-fly increment. Also, the Bash shell provides a builtin expansion mechanism that achieves the same without calling an external tool.
One of the primary incentives to use it nowadays is that it allows to generate lists of floating-point numbers - a feature difficult to perform natively in most shells, which are only capable of integer arithmetic. In addition, it accepts printf style formatting instructions for finer output control.
