bash: echo followed by command on the same line ???
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I'm not sure if you're asking about the output or about the command line. In the first case, if you want the result of the second command inlined with the output of echo, just try the -n option. This makes echo not print a newline at the end.
Multiple commands are combined with list operators. From the bash man page:
A list is a sequence of one or more pipelines separated by one of the operators ;, &, &&, or ||, and optionally terminated by one of ;, &, or <newline>.
Of these list operators, && and || have equal precedence, followed by ; and &, which have equal precedence.
A sequence of one or more newlines may appear in a list instead of a semicolon to delimit commands.
If a command is terminated by the control operator &, the shell executes the command in the background in a subshell. The shell does not wait for the command to finish, and the return status is 0. Commands separated by a ; are executed sequentially; the shell waits for each command to terminate in turn. The return status is the exit status of the last command executed.
AND and OR lists are sequences of one of more pipelines separated by the && and || control operators, respectively. AND and OR lists are executed with left associativity. An AND list has the form
command1 && command2
command2 is executed if, and only if, command1 returns an exit status of zero.
An OR list has the form
command1 || command2
command2 is executed if and only if command1 returns a non-zero exit status. The return status of AND and OR lists is the exit status of the last command executed in the list.
Depending on exactly what you want to do you might also be able to use command substitution to creatively embed one command inside another in some way.
why didn't you just try it? I did, it worked like a charm
Sometimes the results are indeterminate, and you really need to know what is assured. For example:
echo "this is a test" >/tmp/testfile & ls -l /tmp/
Now the first command is being run in the background, and there is no assurance which command will run first. Indeed, since echo is a shell builtin command, the results could be entirely different from what you might see with an external command, but in neither case is the result guaranteed one way or the other.