Bash script for editing contents of one file according to other

kkpal · 02-25-2008, 08:26 AM

hi
all

let suppose I have two files: test1 and test2.
I am giving you some part of that files.
test1
<DefaultPrinter kkp>
Info
Location
DeviceURI ipp://192.168.10.22:9100
state Idle
........
.......

and test2
...some text
...... some text....
default_printer pal
printer "pal" {
location
model
......
...
Interface_args {"REMOTE_PORT" = "9100", "REMOTE_HOST" = "192.168.10.251"
}

I want to read next string from default_printer and next string from REMOTE_HOST from test2 file and edit test1 file (by replacing next string from DefaultPrinter and next string from ipp://.

How can I do these things?

slakmagik · 02-25-2008, 10:06 AM

Code:

#!/bin/bash
dp=$(awk '/default_printer/{ print $2 }' file2)
rh=$(awk -vFS='=' '/REMOTE_HOST/{ gsub(/"/,""); print $3 }' file2)
sed "s/<DefaultPrinter kkp>/$dp/;/DeviceURI/s,ipp://192.168.10.22:9100,ipp:$rh," file1

It uses awk to pull out the two strings wanted and then plugs them into a sed expression which will print them out by substituting parts of the other file.

I wasn't entirely clear on which parts you wanted where, but I think that's it and the principle should work, whatever the details.

slakmagik · 02-25-2008, 10:29 AM

It occurs to me that posting some output might help let you know if I was in the ballpark or not. (Red stuff is changed.)

Code:

pal
Info
Location
DeviceURI ipp: 192.168.10.251
state Idle
........
.......

kkpal · 02-26-2008, 01:03 AM

hi

It gives me error:
sed: -e expression #1, char 28: unterminated `s' command

and How to extract "}" from rh.
and I want o/p like:
<DefaultPrinter pal>
DeviceURI ipp: 192.168.10.251:9100

Thanks
KKPal

slakmagik · 02-26-2008, 01:33 AM

Quote:

Originally Posted by kkpal

hi

It gives me error:
sed: -e expression #1, char 28: unterminated `s' command

and How to extract "}" from rh.
and I want o/p like:
<DefaultPrinter pal>
DeviceURI ipp: 192.168.10.251:9100

Thanks
KKPal

I get no error. Sure there wasn't a pasting error?

I'm not sure what you mean about 'extract "}"' but the following changes the '<DefaultPrinter' bit like you say. The DeviceURI you list (192.168.10.251:9100) is what was in the original. If that's what you want, just don't do anything to it.

Code:

:cat kkpal
#!/bin/bash
dp=$(awk '/default_printer/{ print $2 }' file2)
rh=$(awk -vFS='=' '/REMOTE_HOST/{ gsub(/"/,""); print $3 }' file2)
sed "/<DefaultPrinter.*>/s/kkp/$dp/;/DeviceURI/s,ipp://192.168.10.22:9100,ipp:$rh," file1

:./kkpal
<DefaultPrinter pal>
Info
Location
DeviceURI ipp: 192.168.10.251
state Idle
........
.......

Oh - if you mean you want *only* the output of the changed lines, change it to this:

Code:

:cat kkpal
#!/bin/bash
dp=$(awk '/default_printer/{ print $2 }' file2)
rh=$(awk -vFS='=' '/REMOTE_HOST/{ gsub(/"/,""); print $3 }' file2)
sed -n "/<DefaultPrinter.*>/s/kkp/$dp/p;/DeviceURI/s,ipp://192.168.10.22:9100,ipp:$rh,p" file1

:./kkpal
<DefaultPrinter pal>
DeviceURI ipp: 192.168.10.251

kkpal · 02-26-2008, 02:11 AM

hi Digiot

Thanks for quick reply.

I am giving you full details what I want to do.

I am writing a code for installing printer. For that I am I run "xpdq" and configure my printer. xpdq stores the configuration in its "printrc" file.
According to printrc file I have to edit /etc/cups/printers.conf file.
First I have to read default_printer name and IP address from "printrc" file. And edit the printers.conf file. I have to change DefaultPrinter name and IP address.
I giving you complete files
printers.conf

# Printer configuration file for CUPS v1.1.23
# Written by cupsd on Wed Jul 11 13:08:38 2007
<DefaultPrinter kkp>
Info
Location
DeviceURI ipp://192.168.10.22:9100
State Idle
Accepting Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
</Printer>

printrc

# Redefinitions are silently ignored. Be careful to define last the
# choices you want. The order of processing is /etc/pdq/printrc and
# then ~/.printrc

########################################################################
#
# Configurable options
#
#

# Directory to store jobs
#job_dir "~/.printjobs"

# Time (in seconds) for which job files will be saved.
# Jobs files will be cleaned up after new jobs finish.
#job_history_duration 259200
job_history_duration 3600

# Maximum number of times to try to connect to the printer.
#max_send_tries 30

# Delay (in seconds) between attempting to resend
#delay_between_tries 10

# Default printer definition
#default_printer pokey

# Path that gets passed to driver scripts
driver_command_path "/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin"

# Path that gets passed to interface scripts
interface_command_path "/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin"

########################################################################
#
# Extra pieces of this config file, that define drivers and interfaces.
#
#

try_include "/etc/pdq/interfaces/*"
try_include "/etc/pdq/drivers/*/*"

default_printer komalpal

printer "niv" {
# Added by the wizard on Mon Feb 25 21:02:18 2008
location "nivio"
model "hp3390"
driver "generic-postscript"
interface "tcp-port"
driver_opts { }
driver_args {"COPIES" = "1"}
interface_opts { }
interface_args {"REMOTE_PORT" = "9100", "REMOTE_HOST" = "192.168.10.251"}
}

How can I do that ?

slakmagik · 02-26-2008, 02:46 AM

Code:

:cat kkpal
#!/bin/bash
dp=$(awk '/^default_printer/{ print $2 }' printrc)
rh=$(awk -vFS='=' '/^interface_args/{ gsub(/["} ]/,""); print $3 }' printrc)
sed "
    s,\(^<DefaultPrinter\).*>,\1 $dp>,
    s,\(^DeviceURI ipp:\).*,\1 $rh,
" printers.conf

:./kkpal
# Printer configuration file for CUPS v1.1.23
# Written by cupsd on Wed Jul 11 13:08:38 2007
<DefaultPrinter komalpal>
Info
Location
DeviceURI ipp: 192.168.10.251
State Idle
Accepting Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
</Printer>

I changed it in case 'kkp' and '192.168.10.22:9100' change. I see now what you mean about the "}". In the original sample, that wasn't there. Broadening the regex seems to take care of that. If the above works and you have GNU sed, changing 'sed' to 'sed -i~' should do. If not, the usual redirect-and-overwrite.

-- Actually, made a few more changes to make it more consistent and readable, even though there's not much there to read.

kkpal · 02-26-2008, 03:29 AM

hi

this line is not changed
"DeviceURI ipp://192.168.10.22:9100"

I am getting only
"DeviceURI ipp:192.168.10.251"

I need
"DeviceURI ipp://192.168.10.251:9100"

I changed this line
s,$^DeviceURI// ipp:$.*,\1 $rh:9100,

its working fine.
I want to know I did write thing?

Thanks
KKPal

slakmagik · 02-26-2008, 03:49 AM

Sorry, I don't even own a printer, but I see what you mean about the port number now. As far as whether you did the right thing, if it works, you did the right thing.

But it seems that would work as long as it was always 9100. I see now that REMOTE_PORT is also in the interface_args so maybe adding the

Code:

rp=$(awk -vFS='[=,]' '/^interface_args/{ gsub(/["} ]/,""); print $2 }' printrc)

variable and changing the DeviceURI line to

Code:

s,\(^DeviceURI ipp:\).*,\1 $rh:$rp,

would allow that number to vary and still work. Of course, by this time, the entire thing should be rewritten but maybe this will do.

If the number won't ever change though, doing what you did is far more efficient.

-- This should be better:

Code:

#!/bin/sh
vars=( $(awk '
BEGIN{ FS="[=, :]" }
/^default_printer/{ dp=$2 }
/^interface_args/{ gsub(/["} ]/,""); rh=$2 }
/^interface_args/{ gsub(/["} ]/,""); rp=$4 }
END{ print dp, rh, rp }' printrc ) )

sed "
    s,\(^<DefaultPrinter\).*>,\1 ${vars[0]}>,
    s,\(^DeviceURI ipp:\).*,\1 ${vars[2]}:${vars[1]},
" printers.conf

This way we just invoke awk once.