#8852 - ldap sync output filter

edit.sh

+#!/bin/sh
+#####################################################################
+#####################################################################
+##   The cause of this script is to make the output of the LDAP    ##
+##   sync cron job more readable by filtering all repeated lines   ##
+#####################################################################
+#####################################################################

[f.lopez, 2018/05/15 00:51:19]

"Filters out repeated lines from LDAP sync cron job output"

Or something like that, no need to put `The cause of this script` or whatever,
the shorter, the better (unlike my codereviews)

Also, no need to add 4 lines of pure `#`.
Just one `#` is enough for the actual documentation

+
+last_updated=""
+
+while IFS= read -r line; do

[f.lopez, 2018/05/15 00:51:19]

This IFS set is redundant here because you are quoting `$line`.
Quoting of variables avoid expansions and word splitting, among other things.

On a side note, I wonder if the loop is necessary, can't you just pass the whole
text? I don't have an example to test this, but maybe you can avoid looping
through every line.

+  if echo "$line" | grep -q "Updating" ||

[f.lopez, 2018/05/15 00:51:19]

can't you avoid repeating yourself here with the `-e` flag?

for example(untested code):

```
if echo "$line" | grep -e "Updating" \
                       -e "Creating"
```

+     echo "$line" | grep -q "Creating"
+  then
+    last_updated="$line"
+  fi
+
+  if echo "$line" | grep -q -v "Updating" &&

[f.lopez, 2018/05/15 00:51:19]

You can use the `-F` flag for all lines so you don't repeat yourself,

something like this (untested code):

```
patterns="Updating
Creating
Found
#
Synchronizing
->"

if echo "$line" | grep -q -v -F "${patterns}"
```
The -F flag works here cause it needs to match all of them.

+     echo "$line" | grep -q -v "Creating" &&
+     echo "$line" | grep -q -v "Found" &&
+     echo "$line" | grep -q -v "#" &&
+     echo "$line" | grep -q -v "Synchronizing" &&
+     echo "$line" | grep -q -v -F -e "->"
+  then
+    echo $line 

[f.lopez, 2018/05/15 00:51:19]

my editor shows an empty space at the end of this line, please make sure there
is no empty spaces at the end of any line

+  fi
+
+  if echo "$line" | grep -q -F -e "->"

[f.lopez, 2018/05/15 00:51:19]

no need for `-F` flag since you are matching a single pattern.

no need for `-e` flag since you are not using regex either.

+  then
+    echo $last_updated
+    echo $line

[f.lopez, 2018/05/15 00:51:19]

Quote both lines here

http://www.tldp.org/LDP/abs/html/quoting.html

+  fi
+done

[f.lopez, 2018/05/15 00:51:19]

add an empty line at the end of the file