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Full Discussion: Replace special characters
Top Forums Shell Programming and Scripting Replace special characters Post 302584120 by ratheeshjulk on Thursday 22nd of December 2011 08:18:55 PM
Old 12-22-2011
Replace special characters
I have a line ending with special character and 0
The special character is the field separator for this line
in VI mode the file will look like below, but while cat the special character wont display

i know the hexa code for the special character ^_ is \x1f and ascii code is
\0037,


Code:
000^_^_^_^_^_^_0.000000^_^_^_^_^_^_^_^_^_^_^_^_0^_0.000000^_^_^_^_0^_0^_^_^_0



I can filter these lines which is ending with ^_0 with the below command

Code:
grep `echo "\0037"`0$ filenam


Now my requirement is i want add one end delimiter to such lines.
simply i want replace the last ^_0with ^_0{}, where {} is the new sring i am going to add as an end delimeter


the whole file will look like this
Code:
30093354^_40^_1^_1^_615220181^_1324314123^_b0002
b00^_^_^_b0002
b0002/038513530400025^_2^_9^_3^_1324929600^_1^_1^_19.070000^_0.000000^_19.070000^_0.000000^_0.000000^_USD ^_1.000000^_USD ^_0^_1^_1^_1^_^_^_^_^_3^_^_2^_ ^_1324314123907^_^_^_^_0^_0.000000^_^_^_^_^_^_^_^_0^_0.000000^_^_^_^_0^_0^_^_^_0
68576101^_4^_1^_1^_628398181^_1323894124^_m1500
M15^_^_^_m1500
M1500/038513480015005^_2^_9^_3^_1324501200^_1^_1^_31.410000^_0.000000^_31.410000^_0.000000^_0.000000^_USD ^_1.000000^_USD ^_0^_0^_0^_0^_^_^_^_56^_3^_^_20^_ ^_1323894124565^_^_^_^_0^_0.000.000000^_^_^_^_^_^_^_^_^_^_^_^_0^_0.000000^_^_0^_0^_0^_0^_^_^_0

>

out put should be something like this

Code:
30093354^_40^_1^_1^_615220181^_1324314123^_b0002
b00^_^_^_b0002
b0002/038513530400025^_2^_9^_3^_1324929600^_1^_1^_19.070000^_0.000000^_19.070000^_0.000000^_0.000000^_USD ^_1.000000^_USD ^_0^_1^_1^_1^_^_^_^_^_3^_^_2^_ ^_1324314123907^_^_^_^_0^_0.000000^_^_^_^_^_^_^_^_0^_0.000000^_^_^_^_0^_0^_^_^_0{}
68576101^_4^_1^_1^_628398181^_1323894124^_m1500
M15^_^_^_m1500
M1500/038513480015005^_2^_9^_3^_1324501200^_1^_1^_31.410000^_0.000000^_31.410000^_0.000000^_0.000000^_USD ^_1.000000^_USD ^_0^_0^_0^_0^_^_^_^_56^_3^_^_20^_ ^_1323894124565^_^_^_^_0^_0.000.000000^_^_^_^_^_^_^_^_^_^_^_^_0^_0.000000^_^_0^_0^_0^_0^_^_^_0{}

>

---------- Post updated at 08:18 PM ---------- Previous update was at 08:21 AM ----------

I solved the issue, But for some reason i could'nt use the desired string '{}' but managed with 'Ç'

Code:
perl -i -ne 's;(\x1F)0\n;\x1F0Ç\n;g;print;' file

 

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LEARN ABOUT DEBIAN

dtfits

dtfits(1)						      General Commands Manual							 dtfits(1)

NAME

       dtfits - display FITS table

SYNOPSIS

       dtfits <table>

DESCRIPTION

       dtfits  dumps the contents of a FITS table in an ASCII format, either into a user-specified file or on stdout. The output is formatted on a
       fixed number of columns to make it readable by human beings. Additional informations are printed out before the table  values  are  dumped,
       these informations can be skipped by using the -d option.

       Last,  if  you  want  to dump the table into an easily parsable format (for a piece of software), you might want to use the -s option which
       specifies a character to use as separator. All data fields will be printed out separated by this character only. This allows to use  string
       parsers	to  cut down the output lines into tokens by looking for this separator. Fields (lines) will still be delimited by the end-of-line
       character. This option produces ASCII tables which are easy to parse for a piece of software but mostly unreadable to human beings.

       Notice that dtfits only accepts one single FITS table in input.

OPTIONS

       -d     Skip information output about the table and column names. Outputs only the table values. Beware that if the FITS file contains  sev-
	      eral extensions, they will all appear one after another, separated only by two blank lines. In that case, it would be preferrable to
	      keep the complete output and parse out the returned stream to differentiate which data come from where.

       -s <char>
	      Use the character <char> as separator in output. This option is useful if you want to produce a table that should  be  parsed  by  a
	      piece  of software (see above description). The separator can only be a single non-null character. To avoid special characters being
	      interpreted by the shell, it is recommended to provide this character always between simple or double quotes. Example:
	      dtfits -s '&' table.tfits

       If you want to use a special character as separator, such as a tab, use ^V to insert your character, such as:
       dtfits -s '^V<TAB>' table.tfits

       which means: you type CTRL-V and then the tab key.

SEE ALSO

       dfits

FILES

       FITS tables are stored into extensions. If there are several tables in a file, they will all be displayed one after  another  in  the  same
       output stream.

								    22 Dec 1999 							 dtfits(1)
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