Sponsored Content
Top Forums Shell Programming and Scripting sed escape character for comment string "/*" Post 302524546 by toeharp on Monday 23rd of May 2011 06:26:58 PM
Old 05-23-2011
sed escape character for comment string "/*"

Good afternoon all,
I'm hoping my newbie question can help bolster someone's street_cred.sh today.

I'm trying to "fingerprint" SQL on its way into the rdbms for a benchmarking process (so I can tie the resource allocation back to the process more precisely).

To do this, I'm essentially picking out the SQL into a variable, and trying to replace the first whitespace character after the first word with my fingerprint, in this case, a benchmark Id and a Run Id.

Oddly, the big hangup seems to be the relatively simple sed substitution... This works just fine...

Code:
bmid=001;runid=000001;taskbody="Select Date;";echo $taskbody | sed "s/ /&\/\* bm=$bmid run=$runid \*\/ /";

...outputting the expected results:
Code:
Select /* bm=001 run=000001 */ Date;

But when I try to use command substitution to save the results back to a variable (I have further processing to do), the substitution for the astrisk "\*" part of my sed command is being treated instead as an "ls \*" function.

Thus this:
Code:
bmid=001;runid=000001;taskbody="Select Date";taskbody=`echo $taskbody | sed "s/ /&\/\* bm=$bmid run=$runid \*\/ /"`; echo $taskbody

...results in this:
Code:
Select /bin /boot /data /dev /etc /home /lib /lib64 /lost+found /media /mnt /opt /proc /root /sbin /srv /sys /tmp /usr /var bm=001 run=000001 */ Date

I tried double (and triple, and quadruple) escape characters, to see if they'd persist outside of the backquotes, but it doesn't seem to make any difference.

I searched around the forums, but I didn't see anything threads about "/*" comment character escape problems. So either I'm the first person ever to do this (right...) or I'm missing something blindingly obvious (more likely).

Thoughts?

Thanks!
Stephen
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Sed - How to escape variable number of "/" (slash) ?

Hi, Can you tell me how to escape a variable number of slash characters in sed "/" ? In the script the code looks like this: cat $file_to_update | sed s/^$param/$param=$tab2*\#\*/1 And the $tab2 value is a path so it will have a number of "/" charracters. # cat db.cfg | sed... (4 Replies)
Discussion started by: majormark
4 Replies

2. Shell Programming and Scripting

removing the "\" and "\n" character using sed or tr

Hi All, I'm trying to write a ksh script to parse a file. When the "\" character is encountered, it should be removed and the next line should be concatenated with the current line. For example... this is a test line #1\ should be concatenated with line #2\ and line number 3 when this... (3 Replies)
Discussion started by: newbie_coder
3 Replies

3. Solaris

Solaris escape my script from "-" to "/226"

Hello everyone. I beg your guys pardon please. I try to ls -al in many path/directories. So, I put the code in text file which look like below; ls -al / ls -al /etc ls -al /etc/default ... however, when I paste it to Solaris over SecureCRT, it seems the code was escaped from "-" to... (0 Replies)
Discussion started by: Smith
0 Replies

4. Shell Programming and Scripting

cat $como_file | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g'

hi All, cat file_name | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g' Can this be done by using sed or awk alone (4 Replies)
Discussion started by: harshakusam
4 Replies

5. Shell Programming and Scripting

Command Character size limit in the "sh" and "bourne" shell

Hi!!.. I would like to know what is maximum character size for a command in the "sh" or "bourne" shell? Thanks in advance.. Roshan. (1 Reply)
Discussion started by: Roshan1286
1 Replies

6. Shell Programming and Scripting

Script to search a string which is in between "" and replace it with another character

Hi, I am trying to search a string from a text file which is in between "" (Double Quotes) (Eg: "Unix"), and replace it with a | where ever it is appearing in the text file and save the file. Please help me. -kkmdv (6 Replies)
Discussion started by: kkmdv
6 Replies

7. Shell Programming and Scripting

How to print range of lines using sed when pattern has special character "["

Hi, My input has much more lines, but few of them are below pin(IDF) { direction : input; drc_pinsigtype : signal; pin(SELDIV6) { direction : input; drc_pinsigtype : ... (3 Replies)
Discussion started by: nehashine
3 Replies

8. Shell Programming and Scripting

Using sed to find text between a "string " and character ","

Hello everyone Sorry I have to add another sed question. I am searching a log file and need only the first 2 occurances of text which comes after (note the space) "string " and before a ",". I have tried sed -n 's/.*string \(*\),.*/\1/p' filewith some, but limited success. This gives out all... (10 Replies)
Discussion started by: haggismn
10 Replies

9. Shell Programming and Scripting

how to use "cut" or "awk" or "sed" to remove a string

logs: "/home/abc/public_html/index.php" "/home/abc/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" how to use "cut" or "awk" or "sed" to get the following result: abc abc xyz xyz xyz (8 Replies)
Discussion started by: timmywong
8 Replies

10. Shell Programming and Scripting

sed random \n for "n" range of character occurrences

I'd like to put paragraph breaks \n\n randomly between 5 - 10 occurrences of the dot character (.), for an entire text file. How to do that? In other words, anywhere between every 5 -10 sentences, a new paragraph will generate. There are no other uses of the (.) except for sentence breaks in... (11 Replies)
Discussion started by: p1ne
11 Replies
TR(1)							      General Commands Manual							     TR(1)

NAME
tr - translate characters SYNOPSIS
tr [ -cds ] [ string1 [ string2 ] ] DESCRIPTION
Tr copies the standard input to the standard output with substitution or deletion of selected characters (runes). Input characters found in string1 are mapped into the corresponding characters of string2. When string2 is short it is padded to the length of string1 by dupli- cating its last character. Any combination of the options -cds may be used: -c Complement string1: replace it with a lexicographically ordered list of all other characters. -d Delete from input all characters in string1. -s Squeeze repeated output characters that occur in string2 to single characters. In either string a noninitial sequence -x, where x is any character (possibly quoted), stands for a range of characters: a possibly empty sequence of codes running from the successor of the previous code up through the code for x. The character followed by 1, 2 or 3 octal digits stands for the character whose 16-bit value is given by those digits. The character sequence followed by 1, 2, 3, or 4 hexadecimal digits stands for the character whose 16-bit value is given by those digits. A followed by any other character stands for that character. EXAMPLES
Replace all upper-case ASCII letters by lower-case. tr A-Z a-z <mixed >lower Create a list of all the words in one per line in where a word is taken to be a maximal string of alphabetics. String2 is given as a quoted newline. tr -cs A-Za-z ' ' <file1 >file2 SOURCE
/src/cmd/tr.c SEE ALSO
sed(1) TR(1)
All times are GMT -4. The time now is 08:40 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy