A Bash DIY data extraction tool
Putting It All Together
You now have the data you need to do your desired analysis. To save typing each command individually, you can put the above commands into a single Bash script as shown in Listing 5.
Listing 5
Complete Bash Script
01 #!/bin/bash 02 # download the websites specified in addresses.txt one by one 03 wget -cv --progress=bar --connect-timeout=30 --force-directories --ignore-length -r -l 7 --convert-links --waitretry=61 -R gif,jpg,png,svg,pdf $(<addresses.txt) 04 # recursively look for the word "abandon" and its variations and print in verbose mode the line before and after the keyword so we can take a quick look at the context 05 grep -r -A1 -B1 "abandon" * > results.txt 06 # find every line that starts with the "--" delimiter and replace it with "12345678" using your favorite text editor 07 # list the first line after "12345678" 08 grep -A 1 -F 12345678 results2.txt > 1stline.txt 09 # delete everything after the "<" character 10 sed 's/<.*//' 1stline.txt > 1stlinefiltered.txt 11 # list every line only once, without its duplicates 12 sort 1stlinefiltered.txt | uniq -u > address_filtered.txt 13 # remove last character form each line (.html-) 14 sed 's/.$//' address_filtered.txt > list_final_address.txt 15 # create a CSV file containing the web addresses 16 cat list_final_address.txt > address.csv 17 # replace "12345678" with "--" in address.csv because "--" might appear in the URL
Then add the addresses to addresses.txt, each on one line, and save the file in the same folder as the Bash script in Listing 5. Make the script executable with
chmod +x scriptname.sh
Then launch it with ./scriptname.sh.
With a few simple Bash commands, you have a DIY text data collection tool that delivers a CSV file for use in your favorite statistical application.
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