Shell (ii) operator

 Numeric Operations

Need to use expr
One=' Expr5 + Ten' echo $one two points Note: there is a space between the expression and the operator, for example2+2Is wrong must be written2 + 2The complete expression is to be ' contained ' note that this character is not a common single quotation mark below the ESC key multiplication sign (*You must add a backslash (\) in front of it to enable multiplication such as: one=' Expr5\* Ten' relational operators : Relational operators support numbers only and do not support strings unless the value of the string is a number-EQ detects whether two numbers are equal and returns true for equality.[$a-eq $b]returns True-NE detects whether two numbers are equal and returns true if they are not equal.[$a-ne $b]returns True. -The GT detects if the number on the left is greater than the right, and returns true if it is.[$a-gt $b]returns false-LT detects if the number on the left is less than the right, and returns true if it is.[$a-lt $b]returns True-GE detects if the number on the left is large equal to the right, and returns true if it is.[$a-ge $b]returns false-Le detects whether the number on the left is less than or equal to the right and, if so, returns True.[$a-le $b]returns the true string operator =Detects whether two strings are equal and returns true for equality.[$a = $b]returns FALSE. !=Detects whether two strings are equal and returns true if they are not equal.[$a! = $b]returns True. -Z detects whether the string length is 0 and returns true for 0.[- Z $a]returns FALSE. -N detects whether the string length is 0 and does not return true for 0.[- Z $a]returns True. StrDetects whether the string is empty and does not return true for null.[$a]returns True. file test Operators -BfileDetects if the file is a block device file, and returns True if it is.[- b $file]returns false-CfileDetects if the file is a character device file, and returns True if it is.[- b $file]returns false-DfileDetects if the file is a directory, and returns True if it is.[- D $file]returns false-FfileDetects if the file is a normal file (neither a directory nor a device file), and returns True if it is.[- F $file]returns True-Gfiledetects if the file has a SGID bit set, and returns True if it is-KfileDetects if the file has a sticky bit set (StickyBit), and returns True if it is.[- k $file]returns false-PfileDetects if the file is a named pipe, and returns True if it is.[- P $file]returns false-UfileDetects if the file has a SUID bit set, and returns True if it is.[- u $file]returns false-RfileDetects if the file is readable and returns true if it is.[- R $file]return-WfileDetects if the file is writable and returns true if it is.[- W $file]returns True-XfileDetects if the file can be executed and, if so, returns True.[- x $file]returns True-SfileDetects whether the file is empty (the file size is greater than 0) and does not return true for null.[- s $file]returns True-EfileDetects whether the file (including the directory) exists and, if so, returns True.[- e $file]Returns True

Shell (ii) operator