The question mark is identified by the shell as a single character. In this case the name is specified as any directory with the second character of the directory name ‘d’, followed by any other characters. find did not output anything because there were no directory names that matched the -name specification.
What is the meaning of $?
$? Expands to the exit status of the most recently executed foreground pipeline. By convention an exit status of 0 means success, and non-zero return status means failure. Learn more about exit statuses on wikipedia.
What is $? bash?
$? is a special variable in bash that always holds the return/exit code of the last executed command. You can view it in a terminal by running echo $? . Return codes are in the range [0; 255]. A return code of 0 usually means everything is ok.
What is $? In Unix?
The $? variable represents the exit status of the previous command. Exit status is a numerical value returned by every command upon its completion. … For example, some commands differentiate between kinds of errors and will return various exit values depending on the specific type of failure.
Is bash a bad word?
Dating back to the 1600s, the simple verb bash is “to hit something with force.” It’s equivalent with the words strike and beat … … Bash, for “to insult or verbally abuse,” emerged by the 1950s out of the original “striking” sense of the verb (i.e., hurling very harsh, even hateful criticism).
What type of word is is?
The word “is” is always used as a verb in written and spoken English. This word is considered as a verb because it expresses existence or a state of being. It is classified under linking verbs and is a derivative of the verb “to be.” In the sample sentence: He is the most intelligent student in class.
What is bash symbol?
Special bash characters and their meaning
| Special bash character | Meaning |
|---|---|
| # | # is used to comment a single line in bash script |
| $$ | $$ is used to reference process id of any command or bash script |
| $0 | $0 is used to get the name of the command in a bash script. |
| $name | $name will print the value of variable “name” defined in the script. |
What is $1 in Linux?
$1 is the first command-line argument passed to the shell script. … $0 is the name of the script itself (script.sh) $1 is the first argument (filename1) $2 is the second argument (dir1)
What is $0 shell?
$0 Expands to the name of the shell or shell script. This is set at shell initialization. If Bash is invoked with a file of commands (see Section 3.8 [Shell Scripts], page 39), $0 is set to the name of that file.