I have a shell script which has this while loop line
"while read tblName xx; do..."
I understand how while loop works but don't know what does this xx stands for?
man ksh , yields:
read [ -ACprsv ] [ -d delim] [ -n n] [ [ -N n] [ [ -t timeout] [ -u unit] [ vname?prompt ] [ vname ... ]
The shell input mechanism. One line is read and is broken up into fields using the characters in IFS as separators. The escape charac-
ter, \, is used to remove any special meaning for the next character and for line continuation. The -d option causes the read to con-
tinue to the first character of delim rather than new-line. The -n option causes at most n bytes to read rather a full line but will
return when reading from a slow device as soon as any characters have been read. The -N option causes exactly n to be read unless an
end-of-file has been encountered or the read times out because of the -t option. In raw mode, -r, the \ character is not treated spe-
cially. The first field is assigned to the first vname, the second field to the second vname, etc., with leftover fields assigned to
the last vname. When vname has the binary attribute and -n or -N is specified, the bytes that are read are stored directly into the
variable. If the -v is specified, then the value of the first vname will be used as a default value when reading from a terminal
device. The -A option causes the variable vname to be unset and each field that is read to be stored in successive elements of the
indexed array vname. The -C option causes the variable vname to be read as a compound variable. Blanks will be ignored when finding
the beginning open parenthesis. The -p option causes the input line to be taken from the input pipe of a process spawned by the shell
using �&. If the -s option is present, the input will be saved as a command in the history file. The option -u can be used to specify
a one digit file descriptor unit unit to read from. The file descriptor can be opened with the exec special built-in command. The
default value of unit n is 0. The option -t is used to specify a timeout in seconds when reading from a terminal or pipe. If vname is
omitted, then REPLY is used as the default vname. An end-of-file with the -p option causes cleanup for this process so that another can
be spawned. If the first argument contains a ?, the remainder of this word is used as a prompt on standard error when the shell is
interactive. The exit status is 0 unless an end-of-file is encountered or read has timed out.
1 Like