如何在bash中将以竖线分隔的文件转换为CSV格式？

Question

I have a gigantic 300MB text file that is a pipe delimited CSV.

Some Writing, Is|Another Field|Anotherfie,ld.
Some Writing, Is|Another Field|Anotherfie,ld.

Is there a way in bash shell to convert it to:

"Some Writing, ","Another Field","Anotherfie,ld."

Answer 1

With sed:

sed 's/^/"/;s/|/","/g;s/$/"/' file

Output:

"Some Writing, Is","Another Field","Anotherfie,ld."
"Some Writing, Is","Another Field","Anotherfie,ld."

If you want to edit your file "in place" add sed's option -i .

Answer 2

Using awk you can do this:

awk -F '|' -v OFS=, '{for(i=1; i<=NF; i++) $i="\"" $i "\""} 1' file.csv
"Some Writing, Is","Another Field","Anotherfie,ld."
"Some Writing, Is","Another Field","Anotherfie,ld."

Answer 3

You can use sed and it's substitution commands:

s/^/"/ will replace (insert) a " sign at the beginning of each line.
s/|/","/g will replace each | character with "," triplet. Note the g letter at the end of command, which instructs it to replace every | occurrence, not only the first one.
And finally:
s/$/"/ will replace (append) a " sign at the end of each line.

So final command will be:

`cat filename.in | sed 's/^/"/;s/|/","/g;s/$/"/` > filename.out`