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I'm working on some old code and I found that I used to use
sed -E 's/findText/replaceWith/g' #findText would contain a regex
but I now try
sed -e 's/findText/replaceWith/g'
It seems to do the same thing, or does it? I kinda remember there being a reason I done it but I can't remember and doing "man sed" doesn't help as they don't have anything about -E only -e that doesn't make much sense ether.
-e, --expression=script
Append the editing commands in script to the end of
the editing command script. script may contain more
than one newline separated command.
I thought -e meant it would match with a regex...
GNU sed version 4.2.1
610
The sed command stands for stream editor in UNIX-based systems. It performs text editing operations on text coming from the standard input or a file. It can perform operations such as deletion, searching, find and replace, or insertion in a file even without opening it.
' means: delete the first line in file "file_name" at place and backup to file. (just like edit file and delete first line directly. )
The SED command in Linux stands for Stream EDitor and is helpful for a myriad of frequently needed operations in text files and streams. Sed helps in operations like selecting the text, substituting text, modifying an original file, adding lines to text, or deleting lines from the text.
From source code, -E is an undocumented option for compatibility with BSD sed.
/* Undocumented, for compatibility with BSD sed. */
case 'E':
case 'r':
if (extended_regexp_flags)
usage(4);
extended_regexp_flags = REG_EXTENDED;
break;
And from manual, -E in BSD sed is used to support extended regular expressions.
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