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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 BSD

mknod

MKNOD(2)							System Calls Manual							  MKNOD(2)

NAME

       mknod - make a special file

SYNOPSIS

       mknod(path, mode, dev)
       char *path;
       int mode, dev;

DESCRIPTION

       Mknod  creates  a new file whose name is path.  The mode of the new file (including special file bits) is initialized from mode.  (The pro-
       tection part of the mode is modified by the process's mode mask (see umask(2))).  The first block pointer of the i-node is initialized from
       dev and is used to specify which device the special file refers to.

       If mode indicates a block or character special file, dev is a configuration dependent specification of a character or block I/O device.	If
       mode does not indicate a block special or character special device, dev is ignored.

       Mknod may be invoked only by the super-user.

RETURN VALUE

       Upon successful completion a value of 0 is returned.  Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

       Mknod will fail and the file mode will be unchanged if:

       [ENOTDIR]      A component of the path prefix is not a directory.

       [EINVAL]       The pathname contains a character with the high-order bit set.

       [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.

       [ENOENT]       A component of the path prefix does not exist.

       [EACCES]       Search permission is denied for a component of the path prefix.

       [ELOOP]	      Too many symbolic links were encountered in translating the pathname.

       [EPERM]	      The process's effective user ID is not super-user.

       [EPERM]	      The pathname contains a character with the high-order bit set.

       [EIO]	      An I/O error occurred while making the directory entry or allocating the inode.

       [ENOSPC]       The directory in which the entry for the new node is being placed cannot be extended because there is no space left  on  the
		      file system containing the directory.

       [ENOSPC]       There are no free inodes on the file system on which the node is being created.

       [EDQUOT]       The directory in which the entry for the new node is being placed cannot be extended because the user's quota of disk blocks
		      on the file system containing the directory has been exhausted.

       [EDQUOT]       The user's quota of inodes on the file system on which the node is being created has been exhausted.

       [EROFS]	      The named file resides on a read-only file system.

       [EEXIST]       The named file exists.

       [EFAULT]       Path points outside the process's allocated address space.

SEE ALSO

       chmod(2), stat(2), umask(2)

4th Berkeley Distribution					   May 23, 1986 							  MKNOD(2)
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