Hi, I have a txt file with columns separated by tabs and based on that file, I want to create a new file that only contains information from some of the columns. This is what I have now awk '{ print $1, $5 }' filename > newfilename That works except that when column 5 contains spaces e.g 123 Street, only 123 shows up and the stree...
I need to read a value from the terminal in a bash script. I would like to be able to provide a default value that the user can change. # Please enter your name: Ricardo^ In this script the prompt is "Please enter your name: " the default value is "Ricardo" and the cursor would be after the default value. Is there a way to do this i...
I want to know if there is a built-in BASH command that prints some text on stderr, just like the echo command that prints text on stdout. I don't want to use temporary io-redirection. I use a built-in command to generate an error on stderr such as ls --asdf (ls: unrecognized option '--asdf') but I want something neater. Edit ---- Actu...
I have this file "file.txt" which I want to split into many smaller ones. This a piece of it: 0 id:2293 7:0.78235 12:0.69205 17:0.79421 21:0.77818 .. 4 id:2293 7:0.78235 8:0.97904 12:0.69205 17:0.31709 .. 1 id:2294 7:0.78235 8:0.90994 17:0.49058 21:0.59326 .. Each line of the file has an id field which looks like "id:1"...
Can anyone tell me what -a means in unix. Please see the following code: if [ "$x" = "$x" -a "y" -eq 0 ] ; then echo $x else echo $y ...
i have two shell scripts: script1.sh echo "`date` : DATE" exit 0; script2.sh ./scripts1.sh if [ $? -eq 0 ]; then reboot; else echo "Failed" fi What should be the result. Ideally it should have been "reboot" , however on some execution i got the "failed" message too. Can anyone explain why this happens? ...
I have to use windows to write some shell scripts. I decided to use emacs, but I get a weird error when running the script: /bin/bash^M: bad interpreter: No such file or directory Correct me if I'm wrong, but that looks like the shebang ends in \r\n instead of just \n. How can I tell emacs to only write \n? I'm in Shell-script major...
I'm working on a Bash shell script that runs several Python scripts like so: cd ${SCRIPT_PATH} python -u ${SCRIPT_NAME} ${SCRIPT_ARGS} >> $JOBLOG 2>&1 At one point, I killed the shell script (using kill PID), but the Python script continued running, even after the script terminated. I thought these would die as soon as the main script...
How can I check if I have any uncommitted changes in my git repository: Changes added to the index but not committed Untracked files from a script? git-status seems to always return zero with git version 1.6.4.2. ...
In the following, does (exp3 -a exp4) get evaluated first? How would I make it more explicit? if [exp1 -o exp2 -o exp3 -a exp4 -o exp5] then ... fi ...
I want to compare two files and see if they are the same or not in my shell script, my way is: diff_output=`diff ${dest_file} ${source_file}` if [ some_other_condition -o ${diff_output} -o some_other_condition2 ] then .... fi Basically, if they are the same ${diff_output} should contain nothing and the above test would evaluate to tr...
#!/bin/ksh is the first line in a shell script always what is the importance of this line and why is it kept as the first line. ...
iam using GET command to get the content of a page.When i write the same command on shell prompt it gives correct result but when i use that in PHP file then sometimes its giving correct result but sometimes it gives only half of the content i.e. end-half portion only. Iam using following command in shell script :- GET http://www.abc.c...
I've got a database dump in MySQL where I want to replace ocurrencies of paths that are in the dump as plaintext. In this particular case I'd like to replace: /var/www/ for /home/www/ How could I safely do that using cat or any other shell tool? ...
I have a bash script that runs on our shared web host. It does a dump of our mysql database and zips up the output file. Sometimes the mysqldump process gets killed, which leaves an incomplete sql file that still gets zipped. How do I get my script to 'notice' the killing and then delete the output file if the killing occurred? Edit: ...
I want to open html files from a shell script. I know that Ubuntu has a command x-www-browser that will open the default browser on the system. I also found via some Googling that the command is part of the debian system. I was wondering if the command is available on non debian based distros. If it isn't is there a standard way of openi...
What is the difference: if IsServerStarted ; then ... and if [ IsServerStarted -eq 0 ] ; then ... Seems to me that these two statements should be equivalent? Strangely the second statement is always true. ...
I have a file which contains several thousand numbers, each on it's own line: 34 42 11 6 2 99 ... I'm looking to write a script which will print the sum of all numbers in the file. I've got a solution, but it's not very efficient. (It takes several minutes to run.) I'm looking for a more efficient solution. Any suggestions? ...
I am trying to analyze the files/directories inside of a directory using a shell script, for example if the file is readable, if it is a file, if it is a directory, etc. My script is set up to take a directory as input. so I would type 'file.sh directoryname'. However, when I create a for loop to analyze the files, it analyzes the files ...
!/bin/ksh # while read line do echo "$line \ n" db2 "Select mandt,kunnr,katr6, bran5 from sapr3.kna1 where mandt='030' and kunnr=$line for read only with UR">> result.txt done and I am getting SQL0401N The data types of the operands for the operation "" are not compatible. SQLSTATE=42818 I want these four field in the...