gistfile1.sh

#!/bin/bash

echo    "Hello, World!"
echo -n "do not output the trailing newline"
echo -e "enable interpretation of backslash escapes"
echo -E "disable interpretation of backslash escapes (default)"

gistfile2.sh-session

$ chmod +x ~/sample.sh

gistfile3.sh-session

$ stat ~/sample.sh
  File: ‘/home/matthew/sample.sh’
  Size: 268             Blocks: 8          IO Block: 4096   regular file
Device: 801h/2049d      Inode: 31484938    Links: 1
Access: (0755/-rwxr-xr-x)  Uid: ( 1000/ matthew)   Gid: ( 1000/ matthew)
Access: 2015-06-20 12:12:29.612627167 +0900
Modify: 2015-06-20 11:50:28.417328297 +0900
Change: 2015-06-20 11:50:28.447328167 +0900
 Birth: -
 

gistfile4.sh-session

$ ~/sample.sh
Hello, World!
do not output the trailing newlineenable interpretation of backslash escapes
disable interpretation of backslash escapes (default)

gistfile5.sh

#!/bin/bash

### SYNOPSIS ###
# echo [SHORT-OPTION]... [STRING]...
# echo LONG-OPTION

PS4=$'\e[41;5m>>>\e[m '
set -x

echo    "Hello, World!"
echo -n "do not output the trailing newline"
echo -e "enable interpretation of backslash escapes"
echo -E "disable interpretation of backslash escapes (default)"
echo --help
echo --version
/bin/echo --help
/bin/echo --version

gistfile6.diff

--- /dev/fd/13	2015-06-21 19:30:00.000000000 +0900
+++ /dev/fd/14	2015-06-21 19:30:00.000000000 +0900
@@ -1,6 +1,17 @@
 #!/bin/bash
 
+### SYNOPSIS ###
+# echo [SHORT-OPTION]... [STRING]...
+# echo LONG-OPTION
+
+PS4=$'\e[41;5m>>>\e[m '
+set -x
+
 echo    "Hello, World!"
 echo -n "do not output the trailing newline"
 echo -e "enable interpretation of backslash escapes"
 echo -E "disable interpretation of backslash escapes (default)"
+echo --help
+echo --version
+/bin/echo --help
+/bin/echo --version

gistfile7.sh-session

$ ~/sample.sh
>>> echo 'Hello, World!'
Hello, World!
>>> echo -n 'do not output the trailing newline'
do not output the trailing newline>>> echo -e 'enable interpretation of backslash escapes'
enable interpretation of backslash escapes
>>> echo -E 'disable interpretation of backslash escapes (default)'
disable interpretation of backslash escapes (default)
>>> echo --help
--help
>>> echo --version
--version
>>> /bin/echo --help
Usage: /bin/echo [SHORT-OPTION]... [STRING]...
  or:  /bin/echo LONG-OPTION
Echo the STRING(s) to standard output.

  -n             do not output the trailing newline
  -e             enable interpretation of backslash escapes
  -E             disable interpretation of backslash escapes (default)
      --help     display this help and exit
      --version  output version information and exit

If -e is in effect, the following sequences are recognized:

  \\      backslash
  \a      alert (BEL)
  \b      backspace
  \c      produce no further output
  \e      escape
  \f      form feed
  \n      new line
  \r      carriage return
  \t      horizontal tab
  \v      vertical tab
  \0NNN   byte with octal value NNN (1 to 3 digits)
  \xHH    byte with hexadecimal value HH (1 to 2 digits)

NOTE: your shell may have its own version of echo, which usually supersedes
the version described here.  Please refer to your shell's documentation
for details about the options it supports.

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'echo invocation'
>>> /bin/echo --version
echo (GNU coreutils) 8.23
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Brian Fox and Chet Ramey.

gistfile8.sh

#!/bin/bash -x

echo "xtrace が ON です"
echo "xtrace を OFF にします"
set +x
echo "xtrace は OFF です"
echo "xtrace を ON にします"
set -o xtrace
echo "xtrace は ON です"
echo "xtrace を OFF にします"
set +o xtrace
echo "xtrace は OFF です"

gistfile9.sh-session

+ echo 'xtrace が ON です'
xtrace が ON です
+ echo 'xtrace を OFF にします'
xtrace を OFF にします
+ set +x
xtrace は OFF です
xtrace を ON にします
+ echo 'xtrace は ON です'
xtrace は ON です
+ echo 'xtrace を OFF にします'
xtrace を OFF にします
+ set +o xtrace
xtrace は OFF です