Can't seem to find the right way to do this, despite checking my regex in a reg checker.
Given a text file containing, amongst others, this entry:
zone "example.net" {
type master;
file "/etc/bind/zones/db.example.net";
allow-transfer { x.x.x.x;y.y.y.y; };
also-notify { x.x.x.x;y.y.y.y; };
};
I want to add lines after the also-notify line, for that domain specifically.
So using this sed command string:
sed '/"example\.net".*?also-notify.*?};/a\nxxxxxxx/s' named.conf.local
I thought should work to add 'xxxxxxx' after the line. But nope. What am I doing wrong?
With POSIX sed, you can use the a for append command with an escaped literal new line:
$ sed '/^[[:blank:]]*also-notify/ a\
NEW LINE' file
With GNU sed, a is slightly more natural since the new line is assumed:
$ gsed '/^[[:blank:]]*also-notify/ a NEW LINE' file
The issue with the sed in your example is two fold.
The first is any sed regex cannot be for a multi-line match as in example\.net".*?also-notify.*?. That is more of a perl type match. You would need to use a range operator for the start as in:
$ sed '/"example\.net/,/also-notify/{
/^[[:blank:]]*also-notify/ a\
NEW LINE
}' file
The second issue is the \n in the appended text. With POSIX sed, the \n is not supported in any context. With GNU sed, the new line is assumed and the \n is out of context (if immediately after the a) and interpreted as an escaped literal n. You can use \n with GNU sed after 1 character but not immediately after. In POSIX sed, leading spaces of the appended line will always be stripped.
Following awk may help on this.
awk -v new_lines="new_line here" '/also-notify/{flag=1;print new_lines} /^};/{flag=""} !flag' Input_file
In case you want to edit Input_file itself then append > temp_file && mv temp_file Input_file to above code too. Also print new_lines here new_lines is a variable you could print the new liens directly too in there.
You're pretty close already. Just use a range (/pattern/,/pattern/{ #commands }) to select the text you want to operate on and then use /pattern/a/\ ... to add the line you want.
/"example\.net"/,/also-notify/{
/also-notify/a\
\ this is the text I want to add.
}
sed trims leading space on text to be appended. Adding a backslash \ at the start of the line prevents this.
In Bash, this would look like something like:
sed -e '/"example\.net"/,/also-notify/{
/also-notify/a\
\ this is the text I want to add.
}' named.conf.local
Also note that sed uses an older dialect of regular expressions that doesn't support non-greedy quantifies like *?.
Related
I am new to linux and any bash scripts and have the following problem:
I have this kryptokey:
-----BEGIN CERTIFICATE-----\n
MIICSTCCAfCgAwIBAgIRAMsLZqD4PavC7NJz7+5ld+EwCgYIKoZIzj0EAwIwdjEL\n
MAkGA1UEBhMCVVMxEzARBgNVBAgTCkNhbGlmb3JuaWExFjAUBgNVBAcTDVNhbiBG\n
cmFuY2lzY28xGTAXBgNVBAoTEG9yZzEuZXhhbXBsZS5jb20xHzAdBgNVBAMTFnRs\n
c2NhLm9yZzEuZXhhbXBsZS5jb20wHhcNMTgxMjMxMTA1ODA5WhcNMjgxMjI4MTA1\n
ODA5WjB2MQswCQYDVQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEWMBQGA1UE\n
BxMNU2FuIEZyYW5jaXNjbzEZMBcGA1UEChMQb3JnMS5leGFtcGxlLmNvbTEfMB0G\n
A1UEAxMWdGxzY2Eub3JnMS5leGFtcGxlLmNvbTBZMBMGByqGSM49AgEGCCqGSM49\n
AwEHA0IABEbH7l3CiqLA4N4wgfilYgyEuxDrMAqDX6BrFOfWhymNosjh5FlJDHtN\n
GPDKhjtrI6e1q0NC0l6wh9h9TrBn7N2jXzBdMA4GA1UdDwEB/wQEAwIBpjAPBgNV\n
HSUECDAGBgRVHSUAMA8GA1UdEwEB/wQFMAMBAf8wKQYDVR0OBCIEIH7OaekSLJda\n
S0yuV9PCsuasGTt/+/35aVBXTVbII2rCMAoGCCqGSM49BAMCA0cAMEQCIEd+YP/6\n
tCzG/LueYTEio8ApQSyz94ju07pmc3LZJDKBAiALu66LKhOpKhogY9XEFg4TScOt\n
el4dC6OnMMTmRsEtoA==\n-----END CERTIFICATE-----\n
saved in a file $replacementOrg1 (is the path to that file).
Now I want to replace in a template $file "INSERT_ORG1_CA_CERT" with this certificate and safe it in $org1. But I need to keep the "\n" Character.
The result should keep the \n and write it into one line.
I already tried:
sed -e "s#INSERT_ORG1_CA_CERT#$(cat $replacementOrg1)#g" $file > $org1
but it interprets the "\n" as new line.
So the final Output should look like this, 1 String in 1 Line:
"-----BEGIN CERTIFICATE-----\nMIICSTCCAfCgAwIBAgIRAMsLZqD4PavC7NJz7+5ld+EwCgYIKoZIzj0EAwIw djEL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\n
el4dC6OnMMTmRsEtoA==\n-----END CERTIFICATE-----\n"
Anybody can help?
Thank you
That is not a valid key. What someone has done is "half-encoding" (I don't know a better term) the newlines - they have added the literal string "\n" before every newline. What you very likely want is either the original key with no "\n" strings or a single line string where every newline has been replaced with "\n".
With the original value you can use replace instead - it supports newlines in the replacement value:
$ replace foo $'foo\nbar' <<< $'x\nfoo\ny'
x
foo
bar
y
Your case should be simply replace 'INSERT_ORG1_CA_CERT' "$(< $replacementOrg1)" "$file" > "$org1".
The substitute command isn't very good with multi-line replacement strings. But we can use GNU sed's read command to work around that:
echo "${replacementOrg1}" |
sed -e '/INSERT_ORG1_CA_CERT/{r /dev/stdin' -e ';d}' ${file} > ${org1}
How it works:
echo the multi-line string, piping it to /dev/stdin.
When sed finds the target "INSERT_ORG1_CA_CERT" it reads /dev/stdin and outputs the contents
then deletes the search string line, (which is presumed to contain no other text).
The tricky part is the inadequately documented r command -- sed assumes everything after the r is part of the filename. If we tried '/INSERT_ORG1_CA_CERT/{r /dev/stdin;d}' it would bomb with the error:
unmatched '{'
Because sed would think the filename was literally "/dev/stdin;d}". But the error message doesn't complain about the missing file, because sed never complains about a missing r filename. Instead sed complains that there's no } closing brace, because sed thinks the } is part of the filename.
To avoid that error we stick an ' -e ' in there.
Is it possible to merge multiple blocks/lines into a "single" line?
So basically if the next line starts with the same "#Msg" tag then append it to the previous line. (Hard to explain, but my example speaks for itself) (The blocks are separated by a new/blank line)
My input file looks like this:
#Msg,00000
#Msg,00001
#Msg,00002
#Msg,00003
#Msg,00004
#Msg,00005
#Msg,00006
#Msg,00007
#Msg,00008
#Msg,00009
#Msg,00010
#Msg,00011
Output should be like this:
#Msg,00000
#Msg,00001 #Msg,00002
#Msg,00003 #Msg,00004
#Msg,00005
#Msg,00006 #Msg,00007 #Msg,00008
#Msg,00009
#Msg,00010 #Msg,00011
Any advice is very welcome.
This would be pretty easy to do in Perl:
perl -00 -ple 'tr/\n/ /'
-e CODE specifies the program.
-p wraps a read/write line loop around it (by default it reads from STDIN, but you can also specify one or more filenames on the command line).
-00 specifies that the input "lines" are actually paragraphs.
-l has two effects: Incoming line terminators are automatically stripped from lines, and outgoing lines get line terminators added to them (and because we used -00 (paragraph mode), our line terminator is actually \n\n).
To recap:
We read the input one paragraph at a time. For each paragraph, we remove any trailing newlines. We then translate every newline to a space. Finally we output the transformed paragraph, followed by \n\n.
No point in trying to produce a shorter code than is possible with Perl!
Collect lines from the input file in list group until a blank line appears. Then output the contents of group, empty it and start again. When end-of-file is encountered output whatever is in group, if it is non-empty.
group = []
with open('vollschauer.txt') as vollschauer:
for line in vollschauer:
line = line.rstrip()
if line:
group.append(line)
else:
if group:
print (' '.join(group))
print()
group = []
if group:
print (' '.join(group))
group = []
$ awk -v RS= -v ORS='\n\n' '{$1=$1}1' file
#Msg,00000
#Msg,00001 #Msg,00002
#Msg,00003 #Msg,00004
#Msg,00005
#Msg,00006 #Msg,00007 #Msg,00008
#Msg,00009
#Msg,00010 #Msg,00011
If you insist on using sed, this should do the trick:
sed -r ':a; N; /^(#[^,]+,).*\n\1/! { P; D }; s/\n/ /; ba' file
It takes different tags into account. Such tags won't be grouped together (that's what I understood is the desired behavior):
$ cat file
#Msg,00000
#Msg,00001
#Hello,00002
#Hello,00003
#What,00004
#What,00005
$ sed -r ':a; N; /^(#[^,]+,).*\n\1/! { P; D }; s/\n/ /; ba' file
#Msg,00000 #Msg,00001
#Hello,00002
#Hello,00003
#What,00004 #What,00005
Note that this solution uses GNU sed.
This might work for you (GNU sed):
sed ':a;N;/^$/M!s/\n/ /;ta' file
Gather up lines, replacing each newline by a space until an empty line.
N.B. The use of the M flag on the repexp /^$/ which matches an empty line on a pattern space containing multiple lines.
I have a ";" delimited file:
aa;;;;aa
rgg;;;;fdg
aff;sfg;;;fasg
sfaf;sdfas;;;
ASFGF;;;;fasg
QFA;DSGS;;DSFAG;fagf
I'd like to process it replacing the missing value with a \N .
The result should be:
aa;\N;\N;\N;aa
rgg;\N;\N;\N;fdg
aff;sfg;\N;\N;fasg
sfaf;sdfas;\N;\N;\N
ASFGF;\N;\N;\N;fasg
QFA;DSGS;\N;DSFAG;fagf
I'm trying to do it with a sed script:
sed "s/;\(;\)/;\\N\1/g" file1.txt >file2.txt
But what I get is
aa;\N;;\N;aa
rgg;\N;;\N;fdg
aff;sfg;\N;;fasg
sfaf;sdfas;\N;;
ASFGF;\N;;\N;fasg
QFA;DSGS;\N;DSFAG;fagf
You don't need to enclose the second semicolon in parentheses just to use it as \1 in the replacement string. You can use ; in the replacement string:
sed 's/;;/;\\N;/g'
As you noticed, when it finds a pair of semicolons it replaces it with the desired string then skips over it, not reading the second semicolon again and this makes it insert \N after every two semicolons.
A solution is to use positive lookaheads; the regex is /;(?=;)/ but sed doesn't support them.
But it's possible to solve the problem using sed in a simple manner: duplicate the search command; the first command replaces the odd appearances of ;; with ;\N, the second one takes care of the even appearances. The final result is the one you need.
The command is as simple as:
sed 's/;;/;\\N;/g;s/;;/;\\N;/g'
It duplicates the previous command and uses the ; between g and s to separe them. Alternatively you can use the -e command line option once for each search expression:
sed -e 's/;;/;\\N;/g' -e 's/;;/;\\N;/g'
Update:
The OP asks in a comment "What if my file have 100 columns?"
Let's try and see if it works:
$ echo "0;1;;2;;;3;;;;4;;;;;5;;;;;;6;;;;;;;" | sed 's/;;/;\\N;/g;s/;;/;\\N;/g'
0;1;\N;2;\N;\N;3;\N;\N;\N;4;\N;\N;\N;\N;5;\N;\N;\N;\N;\N;6;\N;\N;\N;\N;\N;\N;
Look, ma! It works!
:-)
Update #2
I ignored the fact that the question doesn't ask to replace ;; with something else but to replace the empty/missing values in a file that uses ; to separate the columns. Accordingly, my expression doesn't fix the missing value when it occurs at the beginning or at the end of the line.
As the OP kindly added in a comment, the complete sed command is:
sed 's/;;/;\\N;/g;s/;;/;\\N;/g;s/^;/\\N;/g;s/;$/;\\N/g'
or (for readability):
sed -e 's/;;/;\\N;/g;' -e 's/;;/;\\N;/g;' -e 's/^;/\\N;/g' -e 's/;$/;\\N/g'
The two additional steps replace ';' when they found it at beginning or at the end of line.
You can use this sed command with 2 s (substitute) commands:
sed 's/;;/;\\N;/g; s/;;/;\\N;/g;' file
aa;\N;\N;\N;aa
rgg;\N;\N;\N;fdg
aff;sfg;\N;\N;fasg
sfaf;sdfas;\N;\N;
ASFGF;\N;\N;\N;fasg
QFA;DSGS;\N;DSFAG;fagf
Or using lookarounds regex in a perl command:
perl -pe 's/(?<=;)(?=;)/\\N/g' file
aa;\N;\N;\N;aa
rgg;\N;\N;\N;fdg
aff;sfg;\N;\N;fasg
sfaf;sdfas;\N;\N;
ASFGF;\N;\N;\N;fasg
QFA;DSGS;\N;DSFAG;fagf
The main problem is that you can't use several times the same characters for a single replacement:
s/;;/..../g: The second ; can't be reused for the next match in a string like ;;;
If you want to do it with sed without to use a Perl-like regex mode, you can use a loop with the conditional command t:
sed ':a;s/;;/;\\N;/g;ta;' file
:a defines a label "a", ta go to this label only if something has been replaced.
For the ; at the end of the line (and to deal with eventual trailing whitespaces):
sed ':a;s/;;/;\\N;/g;ta; s/;[ \t\r]*$/;\\N/1' file
this awk one-liner will give you what you want:
awk -F';' -v OFS=';' '{for(i=1;i<=NF;i++)if($i=="")$i="\\N"}7' file
if you really want the line: sfaf;sdfas;\N;\N;\N , this line works for you:
awk -F';' -v OFS=';' '{for(i=1;i<=NF;i++)if($i=="")$i="\\N";sub(/;$/,";\\N")}7' file
sed 's/;/;\\N/g;s/;\\N\([^;]\)/;\1/g;s/;[[:blank:]]*$/;\\N/' YourFile
non recursive, onliner, posix compliant
Concept:
change all ;
put back unmatched one
add the special case of last ; with eventually space before the end of line
This might work for you (GNU sed):
sed -r ':;s/^(;)|(;);|(;)$/\2\3\\N\1\2/g;t' file
There are 4 senarios in which an empty field may occur: at the start of a record, between 2 field delimiters, an empty field following an empty field and at the end of a record. Alternation can be employed to cater for senarios 1,2 and 4 and senario 3 can be catered for by a second pass using a loop (:;...;t). Multiple senarios can be replaced in both passes using the g flag.
I have a text file infile1 with 1,000's of lines.
I wish to use sed to extract the occuring instances of a regex pattern match to outfile2.
NB
Each instance of the regex pattern match may occur more than once on each line of infile1.
Each instance of the extracted regex pattern should be printed to a new line in outfile2.
Does anyone know the syntax within sed to place the regex into?
ps the regex pattern is
\(Google[ ]{1,3}“[a-zA-Z0-9 ]{1,100}[., ]{0,3}”\)
Thank you :)
I think you want
grep -oE 'Google[ ]{1,3}"[a-zA-Z0-9 ]{1,100}[., ]{0,3}"' filename
-o tells grep to print only the matches, each on a line of its own, and -E instructs it to interpret the regex in extended POSIX syntax, which your regex appears to be.
Note that [ ] could be replaced with just a space, and you might want to use [[:alnum:] ] instead of [a-zA-Z0-9 ] to cover umlauts and suchlike if they exist in the current locale.
Addendum: It is also possible to do this with sed. I don't recommend it, but you could write (using GNU sed):
sed -rn 's/Google[ ]{1,3}"[A-Za-z0-9 ]{1,100}[., ]{0,3}"/\n&\n/g; s/[^\n]*\n([^\n]*\n)/\1/g; s/\n[^\n]*$//p' filename
To make this work with older versions of BSD sed, use -En instead of -rn. -r and -E enable extended regex syntax. -r was historically used by GNU sed, -E by BSD sed; newer versions of them support both for compatibility. -n disables auto-printing.
The code works as follows:
# mark all occurrences of the regex by circumscribing them with newlines
s/Google[ ]{1,3}"[A-Za-z0-9 ]{1,100}[., ]{0,3}"/\n&\n/g
# Isolate every other line from the pattern space (the matches). This will
# leave the part behind the last match...
s/[^\n]*\n([^\n]*\n)/\1/g
# ...so we remove it afterwards and print the result of the transformation if it
# happened (the s///p flag does that). The transformation will not happen if
# there were no matches in the line (because then no newlines will have been
# inserted), so in those cases nothing will be printed.
s/\n[^\n]*$//p
It can be done with sed too, but it isn't pretty:
sed -n ':start /foo/{ h; s/\(foo\).*/\1/; s/.*\(foo\)/\1/; p; g; s/foo\(.*\)/\1/; b start; }' infile1 >outfile2
-- provided that you replace the four occurences of foo above with your pattern Google {1,3}“[a-zA-Z0-9 ]{1,100}[., ]{0,3}”.
Yeah, I told you it isn't pretty. :)
OCR texts often have words that flow from one line to another with a hyphen at the end of the first line. (ie: the word has '-\n' inserted in it).
I would like rejoin all such split words in a text file (in a linux environment).
I believe this should be possible with sed or awk, but the syntax for these is dark magic to me! I knew a text editor in windows that did regex search/replace with newlines in the search expression, but am unaware of such in linux.
Make sure to back up ocr_file before running as this command will modify the contents of ocr_file:
perl -i~ -e 'BEGIN{$/=undef} ($f=<>) =~ s#-\s*\n\s*(\S+)#$1\n#mg; print $f' ocr_file
This answer is relevant, because I want the words joined together... not just a removal of the dash character.
cat file| perl -CS -pe's/-\n//'|fmt -w52
is the short answer, but uses fmt to reform paragraphs after the paragraphs were mangled by perl.
without fmt, you can do
#!/usr/bin/perl
use open qw(:std :utf8);
undef $/; $_=<>;
s/-\n(\w+\W+)\s*/$1\n/sg;
print;
also, if you're doing OCR, you can use this perl one-liner to convert unicode utf-8 dashes to ascii dash characters. note the -CS option to tell perl about utf-8.
# 0x2009 - 0x2015 em-dashes to ascii dash
perl -CS -pe 'tr/\x{2009}\x{2010}\x{2011}\x{2012\x{2013}\x{2014}\x{2015}/-/'
cat file | perl -p -e 's/-\n//'
If the file has windows line endings, you'll need to catch the cr-lf with something like:
cat file | perl -p -e 's/-\s\n//'
Hey this is my first answer post, here goes:
'-\n' I suspect are the line-feed characters. You can use sed to remove these. You could try the following as a test:
1) create a test file:
echo "hello this is a test -\n" > testfile
2) check the file has the expected contents:
cat testfile
3) test the sed command, this sends the edited text stream to standard out (ie your active console window) without overwriting anything:
sed 's/-\\n//g' testfile
(you should just see 'hello this is a test file' printed to the console without the '-\n')
If I build up the command:
a) First off you have the sed command itself:
sed
b) Secondly the expression and sed specific controls need to be in quotations:
sed 'sedcontrols+regex' (the text in quotations isn't what you'll actually enter, we'll fill this in as we go along)
c) Specify the file you are reading from:
sed 'sedcontrols+regex' testfile
d) To delete the string in question, sed needs to be told to substitute the unwanted characters with nothing (null,zero), so you use 's' to substitute, forward-slash, then the unwanted string (more on that in a sec), then forward-slash again, then nothing (what it's being substituted with), then forward-slash, and then the scale (as in do you want to apply the edit to a single line or more). In this case I will select 'g' which represents global, as in the whole text file. So now we have:
sed 's/regex//g' testfile
e) We need to add in the unwanted string but it gets confusing because if there is a slash in your string, it needs to be escaped out using a back-slash. So, the unwanted string
-\n ends up looking like -\\n
We can output the edited text stream to stdout as follows:
sed 's/-\\n//g' testfile
To save the results without overwriting anything (assuming testfile2 doesn't exist) we can redirect the output to a file:
sed 's/-\\n//g' testfile >testfile2
sed -z 's/-\n//' file_with_hyphens