${var%Pattern}, ${var%%Pattern} ${var%Pattern} Remove from $var the shortest part of $Pattern that matches the back end of $var.
${var%%Pattern} Remove from $var the longest part of $Pattern that matches the back end of $var.
hello
whats the difference between excuting a shell script as
a)sh myscript.sh
b). ./myscript.sh
i noticed that my shell script works fine when i run it as . ./myscript
.sh but fails when i run it as sh myscript.sh could anybody explain why.
the shell script is very simple
... (9 Replies)
I have the following script
awk '$1 ~ /^*+/ {
s += $NF;
m++
}
END {
print NR, m, s
}
and I use it to get results from the following file
A4792 4
COMP9021 5
K9 7
ABC 8
924 1
R2D2 3 (8 Replies)
I have a script that has defined a log file like this.
The name of the script is verify.sh
Inside the script there is some thing like this.
LOG=/usr/verify
TDATE=`date "+%m%d%y"$$`
LOGFILE=$LOG.$TDATE.
and inside the script it has been written as
echo "This is to verify" | tee -a... (2 Replies)
Hi
All,
Can anybody explain what this script is doing?
#!/bin/sh
who | cut -d " " -f1 | sort -u > userlist1
while true ; do
sleep 60
who | cut -d" " -f1 | sort -u >userlist2
for username in `cat userlist1` ; do
if ! grep "^$username$" userlist2 > /dev/null ; then
echo... (0 Replies)
Guys,
was wondering what the meaning of the below bit is ?
awk -F ' ' '{print $1 " " $2 ;}' $TEMPFILE | (rm -f $TEMPFILE; sed 's/$/ '"$box"'/g' > $TEMPFILE)
Can anyone explain this in detail? what is the significance of rm -f $TEMPFILE here? What all IO/buffering happens here ?How the... (0 Replies)
#script
fileused=test.txt
hostname=test.dis.com
ftp $hostname <<-! > $fileused.err 2>&1
put file.txt /usr/text.txt
bye
!
kindly the above script the one marked as Bold and underlined as the above i am declaring the new variable as filename ,But when i used i had used as $fileused.err... (1 Reply)
The following script will create a directory in a directory and will go on as many times as the number you will give in.
I am trying to find out how it works ... can someone please help me with that?
#!/bin/sh
#create a variable and set it to 1
n=1
#start a loop as... (3 Replies)
Hello Guys,
can someone help explain the script below for me? I will really appreciate it.
vi db_script
#!/bin/sh
echo .cron job run on.`date`> cronjob.txt
df -h >> cronjob.txt
echo welcome to home (2 Replies)
Hi
My friend wrote this particular script and won't tell me what it does, and when I run it I don't understand it.
What does the entire script do with specifics please.
Thanks
Bob
#!/bin/bash
current=0
while ; do
if ; then
echo ${current}
current=$((${current}+1))
fi
done (1 Reply)
Hey,
can someone explain me this script?
i=0
while read WORT
do
echo $WORT|grep a>/dev/null || echo$WORT|grep B>dev/null || let i=$i+1
done
echo $i
The first lane initializie the variable i with the value of 0.
The loop line has 3 different options because of ||. The only option I... (10 Replies)
Discussion started by: newuser21
10 Replies
LEARN ABOUT LINUX
erl_format
erl_format(3erl) C Library Functions erl_format(3erl)NAME
erl_format - Create and Match Erlang Terms
DESCRIPTION
This module contains two routines - one general function for creating Erlang terms and one for pattern matching Erlang terms.
EXPORTS
ETERM * erl_format(FormatStr, ... )
Types char *FormatStr;
This is a general function for creating Erlang terms using a format specifier and a corresponding set of arguments, much in the way
printf() works.
FormatStr is a format specification string. The set of valid format specifiers is as follows:
* ~i - Integer
* ~f - Floating point
* ~a - Atom
* ~s - String
* ~w - Arbitrary Erlang term
For each format specifier that appears in FormatStr , there must be a corresponding argument following FormatStr . An Erlang term is
built according to the FormatStr with values and Erlang terms substituted from the corresponding arguments and according to the
individual format specifiers. For example:
erl_format("[{name,~a},{age,~i},{data,~w}]",
"madonna",
21,
erl_format("[{adr,~s,~i}]","E-street",42));
This will create an (ETERM *) structure corresponding to the Erlang term: [{name,madonna},{age,21},{data,[{adr,"E-street",42}]}]
The function returns an Erlang term, or NULL if FormatStr does not describe a valid Erlang term.
int erl_match(Pattern, Term)
Types ETERM *Pattern,*Term;
This function is used to perform pattern matching similar to that done in Erlang. Refer to an Erlang manual for matching rules and
more examples.
Pattern is an Erlang term, possibly containing unbound variables.
Term is an Erlang term that we wish to match against Pattern .
Term and Pattern are compared, and any unbound variables in Pattern are bound to corresponding values in Term .
If Term and Pattern can be matched, the function returns a non-zero value and binds any unbound variables in Pattern . If Term Pat-
tern do not match, the function returns 0. For example:
ETERM *term, *pattern, *pattern2;
term1 = erl_format("{14,21}");
term2 = erl_format("{19,19}");
pattern1 = erl_format("{A,B}");
pattern2 = erl_format("{F,F}");
if (erl_match(pattern1, term1)) {
/* match succeeds:
* A gets bound to 14,
* B gets bound to 21
*/
...
}
if (erl_match(pattern2, term1)) {
/* match fails because F cannot be
* bound to two separate values, 14 and 21
*/
...
}
if (erl_match(pattern2, term2)) {
/* match succeeds and F gets bound to 19 */
...
}
erl_var_content() can be used to retrieve the content of any variables bound as a result of a call to erl_match() .
Ericsson AB erl_interface 3.7.3 erl_format(3erl)