<caption><image_21>The image is a slide from a presentation or presentation. It has a blue background and white text. The slide has a title at the top that reads "First argument on command line". Below the title, there are three bullet points that explain the concept of command line arguments.

The first argument is $1, followed by $2, and the second argument is on command lines. The second argument reads "$9, and it is written in white text on a black background. The third argument is "Ninth argument on Command line". The fourth argument is written as "Name of command executed". The fifth argument is also written as a "Number of Command line arguments".

At the bottom of the slide, there is a table with three columns - S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25, S26, S27, S28, S29, S30, S31, S32, S33, S34</caption><caption><image_22>The image is a screenshot of a computer screen with a list of phone lists on it. The list is written in blue text on a black background. The names of the phone lists are "grep" and "Smith" are written in white text. 

The list is divided into two columns, with the first column listing the phone list and the second column listing a phone list. The phone list is $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31, $32, $33, $34, $35, $36, $37, $38, $39, $40, $41, $42, $43, $44, $45, $46, $47, $48, $50, $51, $52, $53, $54, $55, $56, $57, $58,</caption> line and hand them to the file that contains the command lines that will eventually get executed luckily the shell will do this for us so that we can create scripts that will take arguments the way the shell does this is through the use of special meta characters after the shell scans a command line interprets all the meta characters on the command line and has set the command line into its final set of arguments it stores those arguments in a way that I can reference them through commands in a script file the shell takes the arguments on the command line and puts them in what it calls positional parameters positional parameters all start with a dollar and are followed by a number thus the first argument on the command line is stored in dollar one the second argument is stored in dollar two and so on the first thing on the command line is the command you want to execute and that's stored in a special variable the shell also tells me how many arguments were on the command line in the special variable dollar pound sign in addition all of the arguments on the command line are stored in a single variable which is dollar asterisk you'll be using these all the time and it's good to remember what these represent in our grep command example karat Smith would be stored in dollar one phone dot list would be stored in dollar two and grep would be stored in dollar zero if inside a command file
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