sed operation

What does the s and g used in the following expression ? Tks
sed 's/-error_log//g'`
AXISHKAsked:
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ozoCommented:
man sed
s/regular expression/replacement/flags
Substitute the replacement string for the first instance of the regular expression in the pattern space.
The value of flags in the substitute function is zero or more of the following:
                   g       Make the substitution for all non-overlapping matches of the regular expression, not just the first one.
AXISHKAuthor Commented:
can't get the concept. Is there any example to illustrate more ? Tks
ozoCommented:
echo 'aaa-error_logbbb-error_logccc' | sed 's/-error_log//g'
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Terry WoodsIT GuruCommented:
g is short for global I understand. Without it just the first match would be substituted.
Gerwin Jansen, EE MVETopic Advisor Commented:
sed is a stream editor, you send text to it, either from a file or using echo as demonstrated above.

The most basic use of sed is searching for and replacing text in the stream, so if  you send it:

"hello AXISHK" and you want to replace hello with goodbye then you do this:
echo "hello AXISHK" | sed 's/hello/goodbye/'

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 resulting in: "goodbye AXISHK"

sed then replaces the first occurrence of the word hello on a line with goodbye

If you want to replace every hello on a line you add g at the end (g = global)

If you want to delete (or replace with nothing) then you leave out the word goodbye, you then get:
echo "hello AXISHK" | sed 's/hello//'

Open in new window

 resulting in: " AXISHK" (note the space at the begin)

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AXISHKAuthor Commented:
Tks
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