Scripting clarification

[Omprakash_2]

Hi,

I just want to know how to read a file through script. My requirement is i want to take backup if a file contain the fifth line as "yes". If "Yes" word is there means i need to fire a backup. "No" means i should not.

I am already having a script for only taking the backup. I want to execute through command.

[Mark McDonald_2]

Is the 5th line only "Yes" or "No" OR do you have BACKUP=Yes ?

there are several ways to read the file in to a script.

eg:

cat file | while read LINE
do
:
:
done

you can either count to the 5th line, or look for a string BACKUP

[Omprakash_2]

Hi,

The fifth line is only "Yes" or "No". Can you provide any sample script for the same.

[Mark McDonald_2]

#!/usr/bin/ksh
FILE=/path/filename
count=1
cat $FILE | while read LINE
do

if [[ LNUM -eq 5 && LINE = "Yes" ]]
then
do_backup
commands here
fi

(( count += 1 )) <- check syntax
done

[Mark McDonald_2]

SORRY

change this line:
if [[ $count -eq 5 && $LINE = "Yes" ]]

[Suraj K Sankari]

Hi,
here one more script

[root@rspc521 tmp]# cat srvlist
server1
server2
server3
server4
Yes
server6
server7

[root@rspc521 tmp]# cat myscript
ans=`sed -n '5,5p' srvlist`
if [ $ans=="yes" ]
then
echo " your backup script"
fi


Suraj

[Omprakash_2]

Hi suraj,

I can understand well about your script.

But i am getting following error,

# ./script2
./script2[3]: [sed: not found.

below mentioned script for your convenience.

# pg script1

#!/usr/bin/sh
server1
server2
server3
server4
Yes
server5
server6
--------------------------------------------
# pg script2
#!/usr/bin/sh
ans='sed -n'5,5p'script1'
if [$ans=="Yes"]
then
echo "Your current Location"
pwd
date
fi

--------------------------------------------

[Frank de Vries]

Hi,

Script is good,
but in your environment it can find the
sed editor, or you do not have one
(but that last would be strange)

usual the path is
[root@orasrv1:]/root<>>> which sed
/usr/bin/sed
[root@orasrv1:]/root<>>>

do
export PATH=/usr/bin:$PATH
in your script or session
before running sed command

have fun

[T G Manikandan]

if test `cat /tmp/a.sh|awk 'NR==5 {print $0}'` = "yes"; then echo "fire backup"; else echo "please dont fire backup"; fi

[Omprakash_2]

Hi suraj / Frank,

I am very new to scripting language. I have tried like you said but its still not working i have entered like below required your suggestion..

#!/usr/bin/sh
ans='sed -n'5,5p'script1'
if [$ans=="Yes"]
then
echo "Your current Location"
pwd
date
fi
export PATH=/usr/bin:$PATH
--------------------------------------------

I need to execute this urgent manner...

[Omprakash_2]

Hi Manikandan,

As you said i have edit as below, i am getting output as well. But if i edit script1 without the word "Yes". Its provide me the same output.

# pg script1
#!/usr/bin/sh
server1
server2
server3
server4
server5
server6
(EOF):
--------------------------------------------
# pg script2
#!/usr/bin/sh
#ans='sed -n'5,5p'script1'
if test 'cat /script1'NR==5{print$0}="Yes"
then
echo "Your current Location"
pwd
date
else
echo "stop"
fi

(EOF):
--------------------------------------------
OUTPUT:
-------
# ./script2
Your current Location
/
Fri Apr 3 14:15:22 IST 2009

-------------------------------------------

[T G Manikandan]

`cat /tmp/a.sh|awk 'NR==5 {print $0}'` = "yes"

Please check the quote before cat and after $0}

These quotes are command substitution quotes and not normal single quote.

[T G Manikandan]

I dont see awk statement in your copied version and no spaces too, it should be

if test `cat /script1 |awk 'NR==5 {print$0}'` = "Yes"

[T G Manikandan]

Attaching script2

[Omprakash_2]

Hi Manikandan,

Problem fixed because of you, Thanks a ton its working fine !!!

[Omprakash_2]

Thanks Suraj/Frank & Manikandan...

[T G Manikandan]

wow, it fixed but you give 1 point?

[Dennis Handly]

./script2[3]: [sed: not found.

This says the word "[sed" is not found. You seem to have some missing spaces.

ans='sed -n'5,5p'script1'
if [$ans=="Yes"]

The first problem is the attempted use (as TG said) of archaic ``, instead of the easy to read $()
ans=$(sed -n '5,5p' script1)
Then you are missing that space (as TG said):
if [ "$ans" = "Yes" ]; then

# pg script1
#!/usr/bin/sh

This isn't a script, it is a data file.

>TG: if test `cat /script1 |awk 'NR==5 {print$0}'` = "Yes"

No need for evil cat or test, or ``:
if [ "$(awk 'NR==5 {print $0; exit}' script1)" = "Yes" ]; then

[T G Manikandan]

Thanks Dennis for those corrections.