2015年6月3日 · In the help for sed you will find that -e flag stands for:-e script, --expression=script add the script to the commands to be executed You are not the first to be confused after encountering -e. In your example sed 's/foo/bar/' and sed -e 's/foo/bar/' are equivalent. In both cases s/foo/bar/ is the script that is

Its -i works as follows (from info sed):-i[SUFFIX] --in-place[=SUFFIX] This option specifies that files are to be edited in-place. GNU `sed' does this by creating a temporary file and sending output to this file rather than to the standard output.(1). This option implies `-s'.

Sed (short for stream editor) is a text-processing utility that has been developed at the time when text was processed one line at a time, but remains one of the most powerful Unix/Linux utilities; at the same time, it is a form of scripting language, designed specifically for processing text.

2020年5月2日 · \s is the GNU regular expression shortcut way to write the POSIX expression [[:space:]], which matches any type of (horizontal or vertical) whitespace character (\s also matches newlines if these have been inserted into the …

2014年7月19日 · Here's a technique that does not make use of any implementation specific options to sed (e.g. -E , -r). Instead of describing the pattern as a single regex cat|dog, we can simply run sed twice: echo 'cat dog pear banana cat dog' | sed -e 's/cat/Bear/g' -e 's/dog/Bear/g' It's an obvious workaround really, but worth sharing.

You need to quote \[.*^$/ in the regular expression part of the s command and \&/ in the replacement part, plus newlines.

2014年9月5日 · With sed delete everything in a string before a specific character (define into double bracket [Specific char]). echo "randomcollege-nt\user90" | sed 's/.*[\]//' Means replace all (.*[\]) characters before a \ char with whitespace character(//) If you have a file and want to inplace replace use -i flag in sed command like this:

sed -i 's/^projdir .*$/projdir PacMan/' .ignore ^ and $ are beginning/end-of-line markers, so the pattern will match the whole line; .* matches anything. The -i tells sed to write the changes directly to .ignore, instead of just outputting them

With awk:. awk '1;/PATTERN/{ print "add one line"; print "\\and one more"}' infile Keep in mind that some characters can not be included literally so one has to use escape sequences (they begin with a backslash) e.g. to print a literal backslash one has to write \\.

The GNU sed is able to avoid printing a trailing newline if the last line of the input is missing the newline. Only GNU sed is able to use another delimiter instead of newline (namely NUL bytes with the -z option). All the above points make it difficult to "convert newlines" to anything.