I am using bash. My question is :
Code:
eval echo \h
eval echo \h
both give output as h, but
Code:
eval echo \\h
gives output as h Why ?
Does eval here just remove backslashes (I know the use of eval in the case where substitutions occur)
I want to read a input from user and output something like 'inputcd', which has to escape all backslashes if using double-quote. For instance, the following code would work.
Just curious if any other way I could do it without specify all backslashes? Since that takes much efforts when the sequence is long.
Code:
Having a problem with an unwanted redirection in in a function call. Although this isn't the function it does illustrate the problem:
Code:
#!/bin/bash
doat () {
ALL="sys1 sys2"
for Sys in $ALL;do
echo "---> $Sys <---";
echo $(eval echo $1);
[Code]...
figure out how to get the variable into the command without outputting to the file in the eval statement? So that ssh line that gets executed would look like the following to each iteration of the for loop:
Code:
ssh root@$Sys rpm -qa|sort > /trans/${Sys}-rpm-list.txt;
doat works when the incoming argument doesn't have any redirection in the command.
Code: cmd='date | wc'
$cmd If this script is executed, an error is generated. The reason written was that "The execution fails because the pipe is not expanded and is passed to date as an argument".What is meant by expansion of pipe. When we execute date | wc on the command line, it goes fine.then | is not treated as an argument. Why?
Here is the block of code : (The red part is the code that doesn't work) The file is not created and see the output after the code. # i loop create environment structure and k loop create std procedure sub structure.
for i in TRAX2 TRAX BENCH PROD
do
eval mkdir $"acsayul02501_${i}"
eval chmod 2770 $"acsayul02501_${i}"
[code]....
I was trying to write a graph plotting program with c++. I need to convert the infix expression from user to postfix expression for quick evaluation. However, the evaluation of postfix is kind of interpreted, and thus kind of slow for evaluating huge number of values. Say if I plot an implicit function the penalty is quite huge. Is there a way that I can compile the infix expression from my running graph plotting application for high speed evaluation.
View 6 Replies View RelatedI'm in the middle of a data migration project and I have a text file where the data in one of the fields contains a "" at the end of each line. I know how to do a find and replace on ALL backslashes using something like this:
Code:
:%s/\//g
The above example would replace all backslashes with nothing, effectively "removing" them. Does anyone know how I can apply a similar function that only removes the backslashes that exist at the end of a line?
I have Redhat ES4 installed and am trying to run the following commands
set CMD="ksh - eval $Pfile -csh"
$CMD
$Pfile is a script
and it get the error
ksh: eval: No such file or directory
also, there are no man pages for eval
So far failed to get either RHEL 6.0 Eval or Centos to install on Virtual Box.
Should it really be that difficult?
How do I write a script to convert all DOS style backslashes to UNIX style slashes in a list of files /
View 3 Replies View RelatedErrors received when trying to use drop shadow plugin..
"Error while executing script-fu-drop-shadow:
Error: eval: unbound variable: gimp-image-insert-layer"
"Plug-In 'Drop Shadow' left image undo in inconsistent state, closing open undo groups"
I have a filename file-name-here-1.2.3-i486-2.tar I would like to know how to remove the last two fields leaving only: file-name-here-1.2.3
I can use:
x=file-name-here-1.2.3-i486-2.tar
echo ${a%-*}
to remove the last field (after -) but how do i remove the last two in one fell swoop?
I have a string like this "/home/test/filename.txt" and i want to delete all character after the last "/". how to do that using sed or awk.
View 5 Replies View RelatedHow can I remove all lines which contain A,,,,,, I tried the following sed statements but no luck.
Code:
sed "/A,,,,,,/d file"
sed "/A,,,,,,/d file"
which is the simplest way to have first and last character cropped out from a string? Something simpler than
Code:
echo $STRING | cut -b 2- | rev | cut -b 2- | rev
This is my file, named xxx.c. And there are two functions in it.
[code]...
When I try to compile the whole project, I used -ffunction-sections,-fdata-sections to generate the .o files, use Wl,--gc-sections -Wl,--print-gc-sections to link to the exacutable file. gcc 4.3.2 ld 2.18 Debian 5 After the first time I compiled it, I got a list of Removed functions. But one second later, I rememberd that I forget to close the Compile Switch: Debug. Then I had to recompile it and got another list. Compare these two lists, I found that , bxx isn't on the second list. First I guess that bxx is a debug function but never used in debug mode, and it won't be compiled in release mode. I check the source and find that there was no compile switch for bxx. But it's caller function axx, is removed, both the debug switch is on and off. I try to compiled the project for several times , but the result is the same. I can't realized it , why? Is that the --gc-sections won't remove all the functions not used?
I was preparing a script which will remove all my files from directory which are 24 hour old.I tried some thing like thisfind . ( -name 'log.*' -mtime +1 ) -exec rm {}; but it is throughing error like : missing argument to exec.
View 8 Replies View RelatedI have tried this a million ways, got it to work once but it didn't work sitewide for some reason. I have a url: [URL] and I want it to be found by going to: [URL] I am using this
Code:
RewriteCond %{REQUEST_URI} ^/agents/tp/
RewriteRule ^([^/]+)/?$ agents/tp/$1/index.php [L]
and have also tried something as basic as
Code:
RewriteCond %{REQUEST_URI} ^/agents/tp/
RewriteRule ^(.*)$ agents/tp/$1/index.php [L]
I keep getting "The requested URL /JoeAgent/ was not found on this server." why it's not working?
I am trying to parse some information from a webpage and store the output into an array. Basically i have found using HTML::TokeParser to be useful at stripping out all the html tags, i have one problem with the output though there is 2 occurances of the same "item" within the output.
View 1 Replies View RelatedI am doing a mysql query with a bash shell script like:
mysql translator -u root --password=******** -e "SELECT word FROM tagalog ORDER BY RAND() LIMIT 1" | while read line; do
echo $line
So when I echo the value of $line I get:
word
magandang umaga
"word" is the name of the row in the table and maganda umaga is a randomly selected choice from the row. Is there a way i can remove the name of the row from the variable $line. With a result that will allow me to echo $line and output only the randomly selected entry in from the row e.g. magandang umaga
we have a variable LIBS:
LIBS='-lpq -lmysqlclient -lssl -lpthread -lresolv -lssl -lpthread -lresolv'
I'd want to get:
LIBS='-lpq -lmysqlclient -lssl -lpthread -lresolv'
Bear in mind that LIBS can be variable, I mean I need to drop any duplicate and only retain the last one of each different entry. And we must keep the order as is, I must not sort out them.
So, if LIBS is:
LIBS='-lpq -lmysqlclient -lpthread -lresolv -lpthread -lresolv'
I need: LIBS='-lpq -lmysqlclient -lpthread -lresolv'
I have a multiple txt file in one folder. I would like to remove everything from starting until find string keyword in one folder. Here is the sample of my text:
Code:
5a651a62sf1a54f2a1sf6a4f50a5f4a2f1a2d1sfs11231211f61d021sd1fs1Reassembles21f2sdf122dfs21fs212sdfdsf1s65f1s62f1
So i want to remove everything from starting until reassemble. Here is the sample output:
Code:
s21f2sdf122dfs21fs212sdfdsf1s65f1s62f1
I have multiple file in one folder. So how to use any script to read in one directory folder and do a same task. I prefer using awk, sed or perl.
i have the following:
Quote:
echo %host%|sed "$s/.$//"
this would remove the Last character of the value assigned to the %host%. for example if my value is: abcd i get abc. but i am not able to assign the output. for example when i do
Quote:
set k=`echo %host%|sed "$s/.$//"`
after doing echo %k i get no output at the command prompt...!! whereas when i just type:
Quote:
echo abcd|sed "$s/.$//"
at the command prompt i get abc. maybe some other ways to Remove the Last character...?
I have some data whose no certain pattern. Below is as an example.
20110101 1+1-0 1-1 1+1-2 8- 5 3 0 3 4 5 3 7 4
20110102 1+2-0+1-1-1+2-1+ 9 5 6 2 3 3 5 6 5 4
20110103 1-1-0+1 1 2 2 2+10 3 3 2 4 4 7 7 9 5
20110104 1+3-1 1 1+2-2-1-11+ 5 12 4 4 5 6 6 3 6
20110105 0 0 0 1-1-1-1+1 4+ 0 0 0 3 3 3 5 4 2
20110106 1+0+0 0+0+1 2 4+10- 5 2 0 2 2 4 7 32 7
I want to remove space, + and - mark so that I can get the below such data :
20110101 1 1 0 1 1 1 1 2 8 5 3 0 3 4 5 3 7 4
20110102 1 2 0 1 1 1 2 1 9 5 6 2 3 3 5 6 5 4
20110103 1 1 0 1 1 2 2 2 10 3 3 2 4 4 7 7 9 5
20110104 1 3 1 1 1 2 2 1 11 5 12 4 4 5 6 6 3 6
20110105 0 0 0 1 1 1 1 1 4 0 0 0 3 3 3 5 4 2
20110106 1 0 0 0 0 1 2 4 10 5 2 0 2 2 4 7 32 7
Is it possible by using awk?
I need to write a script which will delete all the previous directories I have created. I have found out how to remove one directory with the following code:find /media/CE40-EB9D -type d -name "week1" -exec rm -rf {} ;but how can I get the same script to remove weeks 2-5?
View 5 Replies View RelatedI'm having a bit of a headbanger trying to work this one out. I'm trying to remove all of the characters on a line apart from the last 17. For example, I need to change this:
Code:
00000000000000000089;0bbfaeb8
01000000000000000089;0bcb5948
00000000000000000089;0bcc4c40
[code]....
I received, three years ago, a DVD opensuse 10.3-eval. Now I vould like to use opensuse 11.4, How to do that ?
View 8 Replies View Relatedi have a table in a text file. How can i remove from that table for example "SLS= " if the value is empty? Is it possible to do it in bash awk or sed? [URL]
10.25 SLS=* G.V.=* BBU=122 G.V.=14
10.28 SLS=196 G.V.=198 BBU=* G.V.=*
10.08 U.T.=* I.M=--
10.15 U.T.=-0.522 I.M=*
How to remove alternate char from file using shell script? If the file content is "1234567890" the output file should be "24680".
sed 's/(.)(.)/2/g' filename
Now there may be small modification to generate two alternate byte, what it should be? If the file content is "1234567890" the output file should be "125689".
the preceding and trailing spaces around the commas in my CSV without destroying my address field. I'm new to regex and sed so this is probably easy but I just can't do it without destroying the Address section. I'm using vanilla Linux and sed 4.1.3I'm willing to use any regex or even awk if needed.
Example:
I need this
randall , dean, 11111 , 1309 Hillside Ave., Warsaw, VA , 23591
[code]....