UNIX for Dummies Questions & Answers

Can any one provide answer for the below 3 requirements,

1.
file.txt
grep "name" file.txt > file1.txt
rm -f file.txt
mv file1.txt file.txt

as per abov,
a pattern grepped in file.txt and the content moved to again file.txt
My need is i want the timestamp of file.txt before chaning and aftr chaning should be same.. so how can i get the timestamp of file.txt before and aftr using touch command?


2.i want to check the log of prevous day for a pattern
can any one please how to get the prev day?

IMPORTANT thin is, the pattern will b present only mon - fri but not sat and sunday... so on monday i want to chk for friday (previous day) not sunday...also if month as 30 days or 31 days it should be calcualted accordingly.

ex: `date +%d` gives 01...20...

structure of log file:
test.01
test.02
;;
test.30

3. file.txt
a,b,c
d,e

from the file.txt i want o/p as
a
b
c
d
e
how this can b acheived usin cut cmd...

can any one please answer the abv3 que????

1)

Code:

var=`ls -l file.txt|awk '{print $7$8"08"}'`
var=`echo $var|sed 's/://g'`
mon=`ls -l file.txt|awk '{print $6}'`
mon=`awk -v var=$mon '
BEGIN{
split("JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC", month, " ")
for (i=1; i<=12; i++) mdigit[month[i]]=i
m=toupper(substr(var,1,3))
dat=sprintf("%02d",mdigit[m])
print dat
}'`
time_stamp=`echo $mon$var`

grep "name" file.txt > file1.txt
rm -f file.txt
mv file1.txt file.txt

touch $time_stamp file.txt

2)which OS are you using?? if you have GNU date then you can find option to get yesterday's date in date man page.

3)

Code:

sed 's/,/\
/g' file.txt

Thnx tutor for answers...
i forgot to mention about onething of the 1st que...
1..
file.<day value> ------ i.e file.08(as per yesterday)
grep "name" file.(day value) > file1.(day value)
rm -f file.(day value)
mv file1.(day value) file.(day value)


by current day at particular time for eg. 3PM i wil chheck for the pattern in yesterday(eg: 08) file and move the result to file1.08 then wil remove file.08 and move file1.08 to file.08.
by doin this purpose i want to maintain the timestamp of file.08 to be same after moving for the grep item search. i.e it shuld show the yesterday timestamp even aftr i moved the file.....


2. SOLARIS is used,,, GNU command is not working... can u please let me know how to get ?
------------------------------------------------
i want to check the log of prevous day for a pattern
can any one please how to get the prev day?

IMPORTANT thin is, the pattern will b present only mon - fri but not sat and sunday... so on monday i want to chk for friday (previous day) not sunday...also if month as 30 days or 31 days it should be calcualted accordingly.

ex: `date +%d` gives 01...20...

structure of log file:
test.01
test.02
;;
test.30
-------------------------------------------------

Hi, are You saying that the time stamp is in the file name or is it the actual time stamp of the file You want?
Using

Code:

touch -r file.txt file1.txt

will give file1.txt the same access and modification times as file.txt.

If it's in the filename I can't see what the problem is, You already have the filename that You want to use? You use it in the grep statement? You can do something like this:

Code:

orgname=file.08
grep "name" $orgname > $orgname.tmp
mv $orgname.tmp $orgname

And about getting previous "workday", well this might not be the neatest, but anyway... given You run it on a workday:

Code:

[ $(date +%u) -eq 1 ] && prevwday=3 || prevwday=1
prevwdaynumber=$(date -d "$prevwday days ago" +%d)

Best regards,
Lakris

PS And about Your third original question, why does this look so much like a homework?
I'm not sure about cut but tr would do the trick just fine...

tr , "\n" < file.txt