#!/bin/bash -
#
# Add "-e" Mean Exit Immediately If A Command Exits With A Non-Zero Status.
# Add "-v Mean Prints Shell Input Lines As They Are Read.
# Add "-x Mean Print Command xTraces Before Executing Command.
#
# This Script ...
# ...
#
bash -x myscript.sh
Or
bash -vx myscript.sh
Or
bash -evx myscript.sh
if [ $# -eq 0 ]; then
echo ""
echo "Usage"
echo " `basename $0` Arg1 [Arg2]"
echo " Arg1 = foo | bar"
echo ""
echo "Example:"
echo " `basename $0` foo"
echo " `basename $0` bar"
# Return With Non-Zero Status (Indicating Error)
exit 1
fi
if [[ $# -eq 0 || $# -gt 2 ]]; then
echo ""
echo "Usage"
echo " `basename $0` Arg1 [Arg2]"
echo " Arg1 = foo | bar"
echo ""
echo "Example:"
echo " `basename $0` foo"
echo " `basename $0` bar"
# Return With Non-Zero Status (Indicating Error)
exit 1
fi
# -eq
# is equal to
# if [ "$a" -eq "$b" ]
#
# -ne
# is not equal to
# if [ "$a" -ne "$b" ]
#
# -gt
# is greater than
# if [ "$a" -gt "$b" ]
#
# -ge
# is greater than or equal to
# if [ "$a" -ge "$b" ]
#
# -lt
# is less than
# if [ "$a" -lt "$b" ]
#
# -le
# is less than or equal to
# if [ "$a" -le "$b" ]
# Setup String Variable
strHome="/home/build/myproject"
strDate=`date '+%Y%m%d_%H%M'`
strArg1=$1
# Redirect Stdout/Stderr To File
exec 1>./$strDate.txt 2>&1
# Redirect Stdout/Stderr To File And Screen
exec > >(tee $strDate.txt) 2>&1
# Log With Date Prompt
function log() {
echo `date '+%Y%m%d_%H%M'` : "$@"
}
log "----------------------------------------"
log ">>> start: git clone"
cd $strHome
mkdir ${strDate}_${strArg1}
cd ${strDate}_${strArg1}
git clone ssh://user@100.100.100.100/home/repo/git/myproject
log "<<< done: git clone"
log "----------------------------------------"
log "----------------------------------------"
log ">>> start: make at $MAKETOP/usr/src"
cd ${strDate}_${strArg1}
make
log "<<< done: make at $MAKETOP/usr/src"
log "----------------------------------------"
function hello {
local HELLO=World
echo $HELLO
}
# if <LIST>; then
# <LIST>
# elif <LIST>; then
# <LIST>
# else
# <LIST>
# fi
#
#-a file
# True if file exists.
#-b file
# True if file exists and is a block special file.
#-c file
# True if file exists and is a character special file.
#-d file
# True if file exists and is a directory.
#-e file
# True if file exists.
#-f file
# True if file exists and is a regular file.
#-g file
# True if file exists and its set-group-id bit is set.
#-h file
# True if file exists and is a symbolic link.
#-k file
# True if file exists and its "sticky" bit is set.
#-p file
# True if file exists and is a named pipe (FIFO).
#-r file
# True if file exists and is readable.
#-s file
# True if file exists and has a size greater than zero.
#-t fd
# True if file descriptor fd is open and refers to a terminal.
#-u file
# True if file exists and its set-user-id bit is set.
#-w file
# True if file exists and is writable.
#-x file
# True if file exists and is executable.
#-O file
# True if file exists and is owned by the effective user id.
#-G file
# True if file exists and is owned by the effective group id.
#-L file
# True if file exists and is a symbolic link.
#-S file
# True if file exists and is a socket.
#-N file
# True if file exists and has been modified since it was last read.
#file1 -nt file2
# True if file1 is newer (according to modification date) than file2.
#file1 -ot file2
# True if file1 is older than file2.
#file1 -ef file2
# True if file1 and file2 have the same device and inode numbers.
#-o optname
# True if shell option optname is enabled. The list of options appears in the description of the `-o' option to set.
#-z string
# True if the length of string is zero. -n string
# True if the length of string is non-zero.
#string1 == string2
# True if the strings are equal. `=' can be used in place of `=='.
#string1 != string2
# True if the strings are not equal.
#string1 < string2
# True if string1 sorts before string2 lexicographically in the current locale.
#string1 > string2
# True if string1 sorts after string2 lexicographically in the current locale.
#arg1 OP arg2
# OP is one of "-eq", "-ne", "-lt", "-le", "-gt", or "-ge".
if [ -z ${MAKETOP} ] ; then
echo "MAKETOP = nothing"
else
echo "MAKETOP = ${MAKETOP}"
fi
if [ -z $2 ] ; then
strFromCommit="HEAD~1"
else
strFromCommit="HEAD~"$2
fi
if grep ^myuser: /etc/passwd >/dev/null 2>&1; then
echo "Yes, it seems I am real"
else
echo "Uh am I a ghost ?"
fi
for (( <EXPR1> ; <EXPR2> ; <EXPR3> )); do
<LIST>
done
# as a special case: without semicolon after ((...))
for (( <EXPR1> ; <EXPR2> ; <EXPR3> )) do
<LIST>
done
# alternative, historical and undocumented syntax
for (( <EXPR1> ; <EXPR2> ; <EXPR3> )) {
<LIST>
}
for m in Apple Sony Panasonic "Hewlett Packard" Nokia
do
echo "Manufacturer is:" $m
done
FilePath=(
"/tmp/path1/" #FilePath[0]
"/tmp/path2/" #FilePath[1]
)
for Path in "${FilePath[@]}"
do
echo "$Path"
done
for i in $(seq 1 5); do echo -n "HelloWorld${i} "; done
for ((x = 0 ; x <= 4 ; x++)); do
echo "Counter: $x"
done
# echo -n "$myloop" # "-n" mean without newline
for myloop in 1 2 3 4 5
do
echo "$myloop"
if [ "$myloop" -eq 3 ]; then
break
fi
done
printArg ()
{
for ARG in "$@"; do echo $ARG; done
}
Then run it at bash
printArg arg1 arg2 arg3
function toBin {
typeset m=$1 n=2 x='x[(n*=2)>m]'
for ((x = x; n /= 2;)); do
printf %d $(( m & n && 1))
done
}
Then run it at bash
toBin 12
# case <WORD> in
# [(] <PATTERN1> ) <LIST1> ;; # or ;& or ;;& in Bash 4
# [(] <PATTERN2> ) <LIST2> ;;
# [(] <PATTERN3> | <PATTERN4> ) <LIST3-4> ;;
# ...
# [(] <PATTERNn>) <LISTn> [;;]
# esac
fruit=$1
case $fruit in
apple)
echo 'I like apple !'
;;
orange | banana)
echo $'Eeeks! I don\'t like those!\nGo away!'
exit 1
;;
*)
echo 'Unknown fruit'
esac
echo $((0x5c6))
printf '%x\n' 1478
Or
printf '%#x' 100
for i in seq 1 100; do printf '%x\n' $i done
echo $(( 1<<14 ))