_content/notes: add new note "sed cheat sheet"

Also add the index for directory notes.

2 files changed, 39 insertions, 0 deletions

diff --git a/_content/notes/index.adoc b/_content/notes/index.adoc
new file mode 100644
index 0000000..5cca1a9
--- /dev/null
+++ b/_content/notes/index.adoc
@@ -0,0 +1,11 @@
+= Notes
+
+link:/notes/A_guide_to_readable_and_performance_wise_code/[A guide to readable and performance wise code]
+
+link:/notes/A_guide_to_version_control/[A guide to version control]
+
+link:/notes/A_guide_to_versioning/[A guide to versioning]
+
+link:/notes/jenkins/[Notes on Jenkins]
+
+link:/notes/sed_cheat_sheet/[sed cheat sheet]
diff --git a/_content/notes/sed_cheat_sheet/index.adoc b/_content/notes/sed_cheat_sheet/index.adoc
new file mode 100644
index 0000000..c8658df
--- /dev/null
+++ b/_content/notes/sed_cheat_sheet/index.adoc
@@ -0,0 +1,28 @@
+= sed cheat sheet
+
+https://man.archlinux.org/man/sed.1[sed(1)^]
+is stream editor for filtering and transforming text.
+It is a powerful tool to manipulate one ore more files, for example search
+and replace.
+
+This notes collect the cases that I use when using
+https://www.gnu.org/software/sed/[GNU sed^].
+
+== Replacing text
+
+Case 1: replace "golang.org/src/pkg" with "go.dev/src" in all asciidoc
+files,
+
+----
+$ find . -name "*.adoc" | xargs sed -i 's#golang.org/src/pkg#go.dev/src#g'
+----
+
+Since the text be searched contains "/" we use the character '#' as
+separator, instead of common one "/".
+
+Case 2: replace "http://" with "https://" but not on line that contains
+"localhost" nor "127.0.0.1",
+
+----
+$ find . -name "*.adoc" | xargs sed -i '/\(localhost\|127.0.0.1\)/! s#http://#https://#g'
+----