# ---------------------------------------------------------
# ---    : How can I remove the first line of a text file using bash/sed script?
#
sed '1d' 
# ---------------------------------------------------------
# ---    :  delete the first line from the file and save it with updated contain. 
sed -i '1d' filename
# ---------------------------------------------------------
# ---    :
#

# line1
# line2
# line3
# line4
# line5
# line6

sed 'N; s/\n//' infile
# line1line2
# line3line4
# line5line6

# ---    :Not nice but works for 3 lines in one:
sed 'N; s/\n//; N; s/\n//' infile
# line1line2line3
# line3line4line6
#
# sed ':a;N;$!ba;s/\n/ /g'
#
cat /etc/passwd | awk -F':' '!/user/ {print $1}' | sed ':a;N;$!ba;s/\n/ /g'
root daemon bin sys sync games man lp mail news uucp proxy www-data backup list irc gnats nobody systemd-network systemd-resolve syslog messagebus _apt lxd uuidd dnsmasq landscape pollinate sshd docker glances smmta smmsp

Add character to the beginning of each line using sed

# ---------------------------------------------------------
# --- Add character to the beginning of each line using sed
#
sed 's/^/#/' file.txt
sed 's/^/ /' file.txt
sed 's/^/ /' file.txt  > new-file.txt

Howto: Linux command line utilities for removing blank lines from text files

# Task: Remove blank lines using sed
sed '/^$/d' input.txt > output.txt
# Task: Remove blank lines whit space/tabs using sed:
sed '/^\s*$/d'
# Task: Remove blank lines using grep
grep -v '^$' input.txt > output.txt

How to remove XML tags from Unix command line?

sed -e 's/<[^>]*>//g' file.xml
#
echo "$WERK_CONNECTION" | awk 'NR==2' RS='<|>'

<!-- connection.xml -->
<server-name>
	<serverName>xxxx<serverName/>
	<databaseName>xxxx<databaseName/>
	<portNumber>1234<portNumber/>
	<user>xxxx<user/>
	<password>xxxx<password/>
	<DatabaseEnv>test<test/>
</server-name>

#!/bin/bash
SERVER_ID='server-name'
#
DB_XML_FILE='connection.xml'
#
WERK_CONNECTION=$(fgrep "<$SERVER_ID>" "$DB_XML_FILE" -A17)
#
SERVER_NAME=$(echo "$WERK_CONNECTION" | awk 'NR==2'| sed 's/\t//g;s/<[^>]*>//g')
DATABASE_NAME=$(echo "$WERK_CONNECTION" | awk 'NR==3'| sed 's/\t//g;s/<[^>]*>//g')
DATABASE_PORT_NUMBER=$(echo "$WERK_CONNECTION" | awk 'NR==4'| sed 's/\t//g;s/<[^>]*>//g')
DATABASE_USER=$(echo "$WERK_CONNECTION" | awk 'NR==5'| sed 's/\t//g;s/<[^>]*>//g')
DATABASE_PASS_WORD=$(echo "$WERK_CONNECTION" | awk 'NR==6'| sed 's/\t//g;s/<[^>]*>//g')
DATABASE_ENV=$(echo "$WERK_CONNECTION" | awk 'NR==7'| sed 's/\t//g;s/<[^>]*>//g')
#

How to strip multipe spaces to one using sed?

# ---------------------------------------------------------
# ---    : How to strip multipe spaces to one using sed?
#

sed -e's/  */ /g' 

tr -s \
# ---------------------------------------------------------

# ---------------------------------------------------------
# ---    : Insert a line before or after a pattern 
#
# Inserting before the pattern:
awk '/XYZpattern/{print "#-------"}1' file
sed 's/.*XYZpattern.*/#-------\n&/' file
# Inserting after the Pattern:
awk '/XYZpattern/{print;print "#-------";next}1' file
sed 's/.*XYZpattern.*/&\n#-------/' file
# ---------------------------------------------------------