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Problem with sed

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Top Forums Shell Programming and Scripting Problem with sed
# 8  
Old 05-04-2010
Quote:
Originally Posted by Perl
Thanks guys but i still have a problem. The value of variable var1 in the given example is not known and can differ with each execution. This variable will have a date value which will be something like var1="2010/04/27"

Therefore I can not use escape charcter since value will not be known.
Is there any way i can use delimeter other than / in sed ? i tried with may characters but it doesnt work.


thanks in advance
Try awk:
Code:
awk '$0 ~ dat{p=1}p' dat=$var1 file

# 9  
Old 05-04-2010
Quote:
Originally Posted by thegeek
yes, you can use a different delimiter.

refer: Unix Sed Tutorial: Advanced Sed Substitution Examples (link removed)
You can change the substitution delimiter, not the matching lines one. (edit: methyl proved me wrong on that in post #14)

---------- Post updated at 09:08 ---------- Previous update was at 08:58 ----------
Quote:
Originally Posted by Perl
I have a variable containing date as "2010/04/27" and I want to print all lines from a file where date apprears till the end of file , and I can not hardcode the value of variable since it keeps on changing


any ideas how to achive this ?
You can use sed to prepend a backslash to each backslash in your variable
Code:
var=$(echo $var | sed 's@/@\\/@g')

and then use the sed script I suggested.
Last edited by jlliagre; 05-04-2010 at 07:41 PM..
# 10  
Old 05-04-2010
also,

Code:
var1='2010/04/27'
var2=${var1//\//\\/} # bash shell

sed -n '/'$var2'/,$p'

# 11  
Old 05-04-2010
MySQL
Code:
var="2010/04/27"

You can use ":" delimeter for process like this..
Code:
echo $var | sed "s:\/:\\\\/:g"
2010\/04\/27

# 12  
Old 05-04-2010
Quote:
Originally Posted by ygemici
You can use ":" delimiter for process like this..
Code:
echo $var | sed "s:\/:\\\\/:g"
2010\/04\/27

Why using double quotes when single ones simplify the syntax:
Code:
echo $var | sed 's:/:\\/:g'
2010\/04\/27

which isn't that different from what I suggested earlier ("@" vs":")
# 13  
Old 05-04-2010
Somebody hinted at this in an earlier post. Use a different delimiter in sed. We don't need to change the format of the date, we just need to use a different delimiter in sed.

In this case we can use "X" as the delimiter. In the script \X tells sed that this is a different delimiter. The technique is described in "man sed".

Code:
Test data  abc04.txt:
line 1
line 2
2010/04/27
line 3
line 4

Script:
#!/bin/ksh
var1='2010/04/27'
cat abc04.txt|sed -n "\X${var1}X,\$ p"


Output:
2010/04/27
line 3
line 4

# 14  
Old 05-04-2010
Thanks for pointing that syntax which I missed in the manual.
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