Shell Programming and Scripting

Hi All,

I'm nik and i'm a newbie in shell script. may i know what is the meaning of the data below in shell.

Code:

${ECHO_CMD} and {TEE_CMD} -a

is this a message like print?

Thanks,
-nikki

"echo" is command used for printing purpose
eg : below will print test to the prompt

Code:

echo "test"

"tee -a" command is used for appending purpose
You can check using man pages how to use these commands

Code:

man tee

Cheers
Harish

oh i see.. now i know.. thank you very much sir.

---------- Post updated at 03:12 PM ---------- Previous update was at 02:56 PM ----------

Sir may i know what is the meaning of this

Code:

script=`${BN_CMD} $0`
PRODUCT_NAME_CONV=`${BN_CMD} $0 | ${AWTS_CMD} -F".sh" '{print $1}'`
INPUT_PARAM="$1"

BN_CMD="/niks/ban/basename
AWTS_CMD="/niks/ban/awk

Thanks,

you can check for both the commands using man page

man awk
man basename

you can use in below manner . this code will give you only test in the output

Code:

basename test.txt .txt

you can use awk for almost ever thing using different combinations
can use for substr , printing any argument for n number of things

will show you few examples below

Code:

ll -rt | awk '{print$3}'

will print the third argument in the ll-rt o/p . By default delimeter used is space

Code:

ll -rt  | awk '{print $NF}'

will print the last argument of ll -rt o/p which will be the file or directory name

Code:

echo "test" | awk '{print substr ($0,2,3)}'

will print "est" in the o/p similar to our pl/sql fn substr

Code:

echo "test/test1" | awk -F "/" '{print$1}'

will print "test" in the o/p . Filtering is done on basis of "/" and print
1st argument i.e on left "/"

Similarly you can do many many more things with "awk" command

Cheers
Haish