I'm running GnuWin32 under Windows 10
I'm trying to run the following sed one-liner using the Gnu Bash shell:
sed -f <(sed -E 's_(.+)\t(.+)_s/\1/\2/g_' C:/dictionary.txt) C:/content.txt
The file substitute sed statement converts dictionary entries into sed expressions. The main sed uses them for the content replacements.
It is described in How to awk to read a dictionary and replace words in a file?
dictionary.txt looks like this:
aluminium<tab>aluminum
analyse<tab>analyze
white spirit<tab>mineral spirits
stag night<tab>bachelor party
savoury<tab>savory
potato crisp<tab>potato chip
mashed potato<tab>mashed potatoes
content.txt looks like this:
The container of white spirit was made of aluminium.
We will use an aromatic method to analyse properties of white spirit.
No one drank white spirit at stag night.
Many people think that a potato crisp is savoury, but some would rather eat mashed potato.
...
more sentences
When running GnuWin32/sed in GnuBash-shell under windows 10, I receive the following error message:
syntax error near unexpected token <(s
How to re-formulate the script to run under GnuWin32/sed under windows 10?
with thanks to https://stackoverflow.com/users/2836621/mark-setchell and https://stackoverflow.com/users/5403468/tiw the solution works when using cygwin64
One way is to write the inner sed output to a temporary file first, use it, and then delete it:
sed -r "s_(.+)\t(.+)_s/\1/\2/g_" C:/dictionary.txt>tmp_script.sed
sed -f tmp_script.sed C:/content.txt
del tmp_script.sed
Another way, based on Mr. Mark Setchell's comment, plus little tweak, with cygwin installed,
this work on both bash and batch:
sed -r "s_(.+)\t(.+)_s/\1/\2/g_" C:/dictionary.txt | sed -f /dev/stdin C:/content.txt
Related
I have the following line in cmdline
sed -e '1s/^/\\documentstyle\[11pt\]\{article\}\n/' -e 's/[0-9]//g' test.txt
My desired output is something like this
\documentstyle[11pt]{article}
rest of the file
However I only get this
\documentstyle[pt]{article}
rest of the file
I can't seem to find a way to insert numbers. I tried backslashing. Solution might be simple, but I'm a newbie with sed.
Note that sed has more commands than just s///. To insert a line at the top of a file:
sed -e '1i\
\\\documentstyle[11pt]{article}' -e 's/[0-9]//g' file
(frustratingly, the number of backslashes to achieve a backslash in the output was found by trial and error)
The bonus is that does not affect your goal to remove numbers.
My second command was removing numbers, working as intended indeed, but I was just trying to do it all at once. Credits to Jonathan Leffler.
I am trying to filter a long html page, for leaving only fingerprints which have a consistent structure. for example:
DCD0 5B71 EAB9 4199 527F 44AC DB6B 8C1F 96D8 BF60
i know how to do it by using standrd command line commands as grep, cut and head/tail, but is there more elegant way to do it with sed? the shell comman i use is long and not looking so nice.
thank you
grep is the right tool for extracting strings from a file based on regular expression matching:
grep -Eo '([A-F0-9]{4}[[:space:]]){9}[A-F0-9]{4}' file.html
Here is a sed command tested with GNU sed 4.2.2:
sed -nr '/(([[:xdigit:]]){4} ?){10}/p' file
It matches and prints
10 groups that are made of
4 hexdigits
followed by an optional space
With GNU sed:
sed -E 's/.*(([A-F0-9]{4}[[:space:]]){9}[A-F0-9]{4}).*/\1/' file
We have a process which can use a file containing sed commands to alter piped input.
I need to replace a placeholder in the input with a variable value, e.g. in a single -e type of command I can run;
$ echo "Today is XX" | sed -e "s/XX/$(date +%F)/"
Today is 2012-10-11
However I can only specify the sed aspects in a file (and then point the process at the file), E.g. a file called replacements.sed might contain;
s/XX/Thursday/
So obviously;
$ echo "Today is XX" | sed -f replacements.sed
Today is Thursday
If I want to use an environment variable or shell value, though, I can't find a way to make it expand, e.g. if replacements.txt contains;
s/XX/$(date +%F)/
Then;
$ echo "Today is XX" | sed -f replacements.sed
Today is $(date +%F)
Including double quotes in the text of the file just prints the double quotes.
Does anyone know a way to be able to use variables in a sed file?
This might work for you (GNU sed):
cat <<\! > replacements.sed
/XX/{s//'"$(date +%F)"'/;s/.*/echo '&'/e}
!
echo "Today is XX" | sed -f replacements.sed
If you don't have GNU sed, try:
cat <<\! > replacements.sed
/XX/{
s//'"$(date +%F)"'/
s/.*/echo '&'/
}
!
echo "Today is XX" | sed -f replacements.sed | sh
AFAIK, it's not possible. Your best bet will be :
INPUT FILE
aaa
bbb
ccc
SH SCRIPT
#!/bin/sh
STRING="${1//\//\\/}" # using parameter expansion to prevent / collisions
shift
sed "
s/aaa/$STRING/
" "$#"
COMMAND LINE
./sed.sh "fo/obar" <file path>
OUTPUT
fo/obar
bbb
ccc
As others have said, you can't use variables in a sed script, but you might be able to "fake" it using extra leading input that gets added to your hold buffer. For example:
[ghoti#pc ~/tmp]$ cat scr.sed
1{;h;d;};/^--$/g
[ghoti#pc ~/tmp]$ sed -f scr.sed <(date '+%Y-%m-%d'; printf 'foo\n--\nbar\n')
foo
2012-10-10
bar
[ghoti#pc ~/tmp]$
In this example, I'm using process redirection to get input into sed. The "important" data is generated by printf. You could cat a file instead, or run some other program. The "variable" is produced by the date command, and becomes the first line of input to the script.
The sed script takes the first line, puts it in sed's hold buffer, then deletes the line. Then for any subsequent line, if it matches a double dash (our "macro replacement"), it substitutes the contents of the hold buffer. And prints, because that's sed's default action.
Hold buffers (g, G, h, H and x commands) represent "advanced" sed programming. But once you understand how they work, they open up new dimensions of sed fu.
Note: This solution only helps you replace entire lines. Replacing substrings within lines may be possible using the hold buffer, but I can't imagine a way to do it.
(Another note: I'm doing this in FreeBSD, which uses a different sed from what you'll find in Linux. This may work in GNU sed, or it may not; I haven't tested.)
I am in agreement with sputnick. I don't believe that sed would be able to complete that task.
However, you could generate that file on the fly.
You could change the date to a fixed string, like
__DAYOFWEEK__.
Create a temp file, use sed to replace __DAYOFWEEK__ with $(date +%Y).
Then parse your file with sed -f $TEMPFILE.
sed is great, but it might be time to use something like perl that can generate the date on the fly.
To add a newline in the replacement expression using a sed file, what finally worked for me is escaping a literal newline. Example: to append a newline after the string NewLineHere, then this worked for me:
#! /usr/bin/sed -f
s/NewLineHere/NewLineHere\
/g
Not sure it matters but I am on Solaris unix, so not GNU sed for sure.
I am trying to write a sed expression that can remove urls from a file
example
http://samgovephotography.blogspot.com/ updated my blog just a little bit ago. Take a chance to check out my latest work. Hope all is well:)
Meet Former Child Star & Author Melissa Gilbert 6/15/09 at LA's B&N https://hollywoodmomblog.com/?p=2442 Thx to HMB Contributor #kdpartak :)
But I dont get it:
sed 's/[\w \W \s]*http[s]*:\/\/\([\w \W]\)\+[\w \W \s]*/ /g' posFile
FIXED!!!!!
handles almost all cases, even malformed URLs
sed 's/[\w \W \s]*http[s]*[a-zA-Z0-9 : \. \/ ; % " \W]*/ /g' positiveTweets | grep "http" | more
The following removes http:// or https:// and everything up until the next space:
sed -e 's!http\(s\)\{0,1\}://[^[:space:]]*!!g' posFile
updated my blog just a little bit ago. Take a chance to check out my latest work. Hope all is well:)
Meet Former Child Star & Author Melissa Gilbert 6/15/09 at LA's B&N Thx to HMB Contributor #kdpartak :)
Edit:
I should have used:
sed -e 's!http[s]\?://\S*!!g' posFile
"[s]\?" is a far more readable way of writing "an optional s" compared to "\(s\)\{0,1\}"
"\S*" a more readable version of "any non-space characters" than "[^[:space:]]*"
I must have been using the sed that came installed with my Mac at the time I wrote this answer (brew install gnu-sed FTW).
There are better URL regular expressions out there (those that take into account schemes other than HTTP(S), for instance), but this will work for you, given the examples you give. Why complicate things?
The accepted answer provides the approach that I used to remove URLs, etc. from my files. However it left "blank" lines. Here is a solution.
sed -i -e 's/http[s]\?:\/\/\S*//g ; s/www\.\S*//g ; s/ftp:\S*//g' input_file
perl -i -pe 's/^'`echo "\012"`'${2,}//g' input_file
The GNU sed flags, expressions used are:
-i Edit in-place
-e [-e script] --expression=script : basically, add the commands in script
(expression) to the set of commands to be run while processing the input
^ Match start of line
$ Match end of line
? Match one or more of preceding regular expression
{2,} Match 2 or more of preceding regular expression
\S* Any non-space character; alternative to: [^[:space:]]*
However,
sed -i -e 's/http[s]\?:\/\/\S*//g ; s/www\.\S*//g ; s/ftp:\S*//g'
leaves nonprinting character(s), presumably \n (newlines). Standard sed-based approaches to remove "blank" lines, tabs and spaces, e.g.
sed -i 's/^[ \t]*//; s/[ \t]*$//'
do not work, here: if you do not use a "branch label" to process newlines, you cannot replace them using sed (which reads input one line at a time).
The solution is to use the following perl expression:
perl -i -pe 's/^'`echo "\012"`'${2,}//g'
which uses a shell substitution,
'`echo "\012"`'
to replace an octal value
\012
(i.e., a newline, \n), that occurs 2 or more times,
{2,}
(otherwise we would unwrap all lines), with something else; here:
//
i.e., nothing.
[The second reference below provides a wonderful table of these values!]
The perl flags used are:
-p Places a printing loop around your command,
so that it acts on each line of standard input
-i Edit in-place
-e Allows you to provide the program as an argument,
rather than in a file
References:
perl flags: Perl flags -pe, -pi, -p, -w, -d, -i, -t?
ASCII control codes: https://www.cyberciti.biz/faq/unix-linux-sed-ascii-control-codes-nonprintable/
remove URLs: sed to remove URLs from a file
branch labels: How can I replace a newline (\n) using sed?
GNU sed manual: https://www.gnu.org/software/sed/manual/sed.html
quick regex guide: https://www.gnu.org/software/sed/manual/html_node/Regular-Expressions.html
Example:
$ cat url_test_input.txt
Some text ...
https://stackoverflow.com/questions/4283344/sed-to-remove-urls-from-a-file
https://www.google.ca/search?dcr=0&ei=QCsyWtbYF43YjwPpzKyQAQ&q=python+remove++citations&oq=python+remove++citations&gs_l=psy-ab.3...1806.1806.0.2004.1.1.0.0.0.0.61.61.1.1.0....0...1c.1.64.psy-ab..0.0.0....0.-cxpNc6youY
http://scikit-learn.org/stable/modules/generated/sklearn.feature_extraction.text.TfidfVectorizer.html
https://bbengfort.github.io/tutorials/2016/05/19/text-classification-nltk-sckit-learn.html
http://datasynce.org/2017/05/sentiment-analysis-on-python-through-textblob/
https://www.google.ca/?q=halifax&gws_rd=cr&dcr=0&ei=j7UyWuGKM47SjwOq-ojgCw
http://www.google.ca/?q=halifax&gws_rd=cr&dcr=0&ei=j7UyWuGKM47SjwOq-ojgCw
www.google.ca/?q=halifax&gws_rd=cr&dcr=0&ei=j7UyWuGKM47SjwOq-ojgCw
ftp://ftp.ncbi.nlm.nih.gov/
ftp://ftp.ncbi.nlm.nih.gov/1000genomes/ftp/alignment_indices/20100804.alignment.index
Some more text.
$ sed -e 's/http[s]\?:\/\/\S*//g ; s/www\.\S*//g ; s/ftp:\S*//g' url_test_input.txt > a
$ cat a
Some text ...
Some more text.
$ perl -i -pe 's/^'`echo "\012"`'${2,}//g' a
Some text ...
Some more text.
$
I use sed to substitute text in files.
I want to give sed a file which contains all the strings to be searched and replaced in a given file.
It goes over .h and .cpp files. In each file it searches for file names which are included in it. If found, it substitutes for example "a.h" with "<a.h>" (without the quotes).
The script is this:
For /F %%y in (all.txt) do
for /F %%x in (allFilesWithH.txt) do
sed -i s/\"%%x\"/"\<"%%x"\>"/ %%y
all.txt - List of files to do the substitution in them
allFilesWithH.txt - All the include names to be searched
I don't want to run sed several times (as the number of files names in input.txt.) but I want to run a single sed command and pass it input.txt as input.
How can I do it?
P.S I run sed from VxWorks Development shell, so it doesn't have all the commands that the Linux version does.
You can eliminate one of the loops so sed only needs to be called once per file. Use
the -f option to specify more than one substitution:
For /F %%y in (all.txt) do
sed -i -f allFilesWithHAsSedScript.sed %%y
allFilesWithHAsSedScript.sed derives from allFilesWithH.txt and would contain:
s/\"file1\"/"\<"file1"\>"/
s/\"file2\"/"\<"file2"\>"/
s/\"file3\"/"\<"file3"\>"/
s/\"file4\"/"\<"file4"\>"/
(In the article Common threads: Sed by example, Part 3 there are many examples of sed scripts with explanations.)
Don't get confuSed (pun intended).
sed itself has no capability to read filenames from a file. I'm not familiar with the VxWorks shell, and I imagine this is something to do with the lack of answers... So here are some things that would work in bash - maybe VxWorks will support one of these things.
sed -i 's/.../...' `cat all.txt`
sed -i 's/.../...' $(cat all.txt)
cat all.txt | xargs sed -i 's/.../...'
And really, it's no big deal to invoke sed several times if it gets the job done:
cat all.txt | while read file; do sed -i 's/.../.../' $file; done
for file in $(cat all.txt); do # or `cat all.txt`
sed -i 's/.../.../' $file
done
What I'd do is change allFilesWithH.txt into a sed command using sed.
(When forced to use sed. I'd actually use Perl instead, it can also do the search for *.h files.)