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  • Newline-separated xargs

    - by porneL
    Is it possible to make xargs use only newline as separator? (in bash on Linux and OS X if that matters) I know -0 can be used, but it's PITA as not every command supports NUL-delimited output.

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  • How can I still see the 'man' text after I quit man?

    - by Sol
    I typically use tcsh or bash and often want to use 'man' to review a command's options. Currently when I quit man or ctrl-C, the man text disappears and I see the scrollback buffer that was there before I performed the 'man' command. I would like to still see the 'man' text I was viewing as a reference while I'm typing the command at the command prompt without opening a second window, how can I do that?

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  • Perl -e insert new line

    - by lydonchandra
    Hi If I do this in bash perl -e '$x; $y' Is there any character that can behave like a new line? i.e. I want to do perl -e '$x; some_chars_as_new_line $y' where perl interpreter actually sees an actual new line. $x; $y; Many thanks

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  • Detecting upload success/failure in a scripted command-line SFTP session?

    - by Will Martin
    I am writing a BASH shell script to upload all the files in a directory to a remote server and then delete them. It'll run every few hours via a CRON job. My complete script is below. The basic problem is that the part that's supposed to figure out whether the file uploaded successfully or not doesn't work. The SFTP command's exit status is always "0" regardless of whether the upload actually succeeded or not. How can I figure out whether a file uploaded correctly or not so that I can know whether to delete it or let it be? #!/bin/bash # First, save the folder path containing the files. FILES=/home/bob/theses/* # Initialize a blank variable to hold messages. MESSAGES="" ERRORS="" # These are for notifications of file totals. COUNT=0 ERRORCOUNT=0 # Loop through the files. for f in $FILES do # Get the base filename BASE=`basename $f` # Build the SFTP command. Note space in folder name. CMD='cd "Destination Folder"\n' CMD="${CMD}put ${f}\nquit\n" # Execute it. echo -e $CMD | sftp -oIdentityFile /home/bob/.ssh/id_rsa [email protected] # On success, make a note, then delete the local copy of the file. if [ $? == "0" ]; then MESSAGES="${MESSAGES}\tNew file: ${BASE}\n" (( COUNT=$COUNT+1 )) # Next line commented out for ease of testing #rm $f fi # On failure, add an error message. if [ $? != "0" ]; then ERRORS="${ERRORS}\tFailed to upload file ${BASE}\n" (( ERRORCOUNT=$ERRORCOUNT+1 )) fi done SUBJECT="New Theses" BODY="There were ${COUNT} files and ${ERRORCOUNT} errors in the latest batch.\n\n" if [ "$MESSAGES" != "" ]; then BODY="${BODY}New files:\n\n${MESSAGES}\n\n" fi if [ "$ERRORS" != "" ]; then BODY="${BODY}Problem files:\n\n${ERRORS}" fi # Send a notification. echo -e $BODY | mail -s $SUBJECT [email protected] Due to some operational considerations that make my head hurt, I cannot use SCP. The remote server is using WinSSHD on windows, and does not have EXEC privileges, so any SCP commands fail with the message "Exec request failed on channel 0". The uploading therefore has to be done via the interactive SFTP command.

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  • How to add an iptables rule with source IP address

    - by ???
    I have a bash script that starts with this: if [[ $EUID -ne 0 ]]; then echo "Permission denied (are you root?)." exit 1 elif [ $# -ne 1 ] then echo "Usage: install-nfs-server <client network/CIDR>" echo "$ bash install-nfs-server 192.168.1.1/24" exit 2 fi; I then try to add the iptables rules for NFS as follows: iptables -A INPUT -i eth0 -p tcp -s $1 --dport 111 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 111 -m state --state ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p udp -s $1 --dport 111 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p udp --sport 111 -m state --state ESTABLISHED -j ACCEPT service iptables save service iptables restart I get the error: Try iptables -h' or 'iptables --help' for more information. Bad argument111' Try iptables -h' or 'iptables --help' for more information. Bad argument111' Saving firewall rules to /etc/sysconfig/iptables: ^[[60G[^[[0;32m OK ^[[0;39m]^M Flushing firewall rules: ^[[60G[^[[0;32m OK ^[[0;39m]^M Setting chains to policy ACCEPT: filter ^[[60G[^[[0;32m OK ^[[0;39m]^M Unloading iptables modules: ^[[60G[^[[0;32m OK ^[[0;39m]^M Applying iptables firewall rules: ^[[60G[^[[0;32m OK ^[[0;39m]^M Loading additional iptables modules: ip_conntrack_netbios_ns ^[[60G[^[[0;32m OK ^[[0;39m]^M When I open /etc/sysconfig/iptables these are the rules: # Generated by iptables-save v1.3.5 on Mon Mar 26 08:00:42 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [466:54208] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A OUTPUT -o eth0 -p tcp -m tcp --sport 111 -m state --state ESTABLISHED -j ACCEPT -A OUTPUT -o eth0 -p udp -m udp --sport 111 -m state --state ESTABLISHED -j ACCEPT -A OUTPUT -o eth0 -p tcp -m tcp --sport 111 -m state --state ESTABLISHED -j ACCEPT -A OUTPUT -o eth0 -p udp -m udp --sport 111 -m state --state ESTABLISHED -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m state --state NEW -m udp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p esp -j ACCEPT -A RH-Firewall-1-INPUT -p ah -j ACCEPT -A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Mon Mar 26 08:00:42 2012 ~ "/etc/sysconfig/iptables" 32L, 1872C I've also tried: iptables -I RH-Firewall-1-INPUT 1 -m state --state NEW -m tcp -p tcp --source $1 --dport 111 -j ACCEPT iptables -I RH-Firewall-1-INPUT 2 -m udp -p udp --source $1 --dport 111 -j ACCEPT

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  • insert newline in perl -e statement

    - by lydonchandra
    Hi If I do this in bash perl -e '$x; $y' How can I insert a new line between the character ; and $y? I don't want to re-type the whole line, I just want to move my cursor to the position and then insert a newline ? Is this possible? Many thanks

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  • Linux command line best practices and tips?

    - by Maxim Veksler
    I would like to open a discussion that would accumulate your Linux command line (CLI) best practices and tips. I've searched for such a discussion to share the below comment but haven't found one, hence this post. I hope we all could learn from this. You are welcome to share your Bash tips, grep, sed, AWK, /proc and all other related Linux/Unix system administration, shell programming best practices for the benefit of us all.

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  • How can I open a file whose name starts with "-"?

    - by PJ
    I am running Ubuntu, and would like to open a file whose file name starts with "-"(minus). When I try to open the file with pico or vim, the command thinks that the "-" sign is an option for the command. I tried enclosing the file name with quotes ('), but I still get the same error. I tried with bash and zsh, but still the same error.

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  • Running multiple SQL files at once

    - by Matt Huggins
    I feel like I've run commands like the following in the past, but I'm getting an error trying it right now. Maybe I'm just having a brainfart, and my syntax is off. mysql -u root -p db_name < *.sql What I expect this to do is run all the SQL files in the folder ordered alphanumerically. However, I'm getting this error: -bash: *.sql: ambiguous redirect

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  • How to keep variable preserve while running script through ssh

    - by Ali Raza
    I am trying to run while loop with read through ssh: #!/bin/bash ssh [email protected] "cat /var/log/syncer/rm_filesystem.log | while read path; do stat -c \"%Y %n\" "$path" >> /tmp/fs_10.10.10.10.log done" But the issue is my variable $path is resolving on my localhost where as I want to resolve it on remote host so that it can read file on remote host and take stat of all folder/files listed in "rm_filesystem.log"

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  • How to set up "vi" shell environment as default

    - by Ency
    It could by silly question, but I can not find answer anywhere. So, I'd like to use vi (you know set -o vi can do the trick) as default in my shell instead of emacs, but I do not want to put it into bash startup scripts. Why? Because I work as verification engineer and I am using several user accounts, which are also quite often reinstalled. Changing of default profile is not answer too, because some of software creates its own home directory (independent on default profile).

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  • Missing Profiles in Ubuntu User

    - by Coyote
    I've got a zen slice running Ubuntu. I set the thing up as root and had "normal" bash and vim profiles, however the new users I've created for myself and others have no profiles. I've tried copying the profiles from root to my user's home directories, but still don't have color or even machine name\login at the prompt. How do I get the options transferred?

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  • retrieving headers / comment blocks

    - by AnC
    I have a number of log files that look like this: /* header arbitrary number of lines */ blah blah blah blah Using simple Bash commands (preferably sed, not awk), how would I retrieve only the header lines (ideally including the comment markers)? I've RTFM and tried googling, also found some hints, but not enough to get me started. Thanks!

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  • Open a terminal window & run command, then close the terminal window if command completed successfully?

    - by Caspar
    I'm trying to write a script to do the following: Open a terminal window which runs a long running command (Ideally) move the terminal window to the top left corner of the screen using xdotool Close the terminal window only if the long running command exited with a zero return code To put it in Windows terms, I'd like to have the Linux equivalent of start cmd /c long_running_cmd if long_running_cmd succeeds, and do the equivalent of start cmd /k long_running_cmd if it fails. What I have so far is a script which starts xterm with a given command, and then moves the window as desired: #!/bin/bash # open a new terminal window in the background with the long running command xterm -e ~/bin/launcher.sh ./long_running_cmd & # move the terminal window (requires window process to be in background) sleep 1 xdotool search --name launcher.sh windowmove 0 0 And ~/bin/launcher.sh is intended to run whatever is passed as a command line argument to it: #!/bin/bash # execute command line arguments $@ But, I haven't been able to get the xterm window to close after long_running_cmd is done. I think something like xterm -e ~/bin/launcher.sh "./long_running_cmd && kill $PPID" & might be what I'm after, so that xterm is launched in the background and it runs ./long_running_cmd && kill $PPID. So the shell in the xterm window then runs the long running command and if it completes successfully, the parent process of the shell (i.e. the process owning the xterm window) is killed, thereby closing the xterm window. But, that doesn't work: nothing happens, so I suspect my quoting or escaping is incorrect, and I haven't been able to fix it. An alternate approach would be to get the PID of long_running_cmd, use wait to wait for it to finish, then kill the xterm window using kill $! (since $! refers to last task started in the background, which will be the xterm window). But I can't figure out a nice way to get the PID & exit value of long_running_cmd out of the shell running in the xterm window and into the shell which launched the xterm window (short of writing them to a file somewhere, which seems like it should be unnecessary?). What am I doing wrong, or is there an easier way to accomplish this?

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  • process killed -- delete output file?

    - by user13743
    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?

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  • Cygwin unable to compile

    - by christine
    I just downloaded Cygwin, I've never used it before cause I've always used putty. Cygwin is not letting me compile; I can see the files but it just doesn't let me compile and I do not understand why, am I doing something wrong? This is what's going on: Christine@Christine-PC ~ $ ls 8.6.c a.b.c a.c.c core new 2.txt test.c 9.13.c a.c a.out days.c new2.c test.txt Christine@Christine-PC ~ $ gcc a.c.c -bash: gcc: command not found

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  • What user is the script run as after Carbon Copy Cloner ends scheduled task?

    - by Paolo
    On Mac OS X I keep data on a local server mirrored with the same data on a remote server with a scheduled backup task done with Carbon Copy Cloner. After the backup is done a bash script is run as specified in the scheduled task options of CCC. Is the script run as root? Or differently and more generally: as my script writes to a log file, what command should I put on my script to see on the log if the script is running as root or something else?

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  • How do I keep gnome-terminal width from changing when I use "reset"

    - by monguin
    When I use reset in gnome-terminal (bash, Ubuntu 9.04), the window width resets, though the height does not. On my personal computer, this does not happen in xterm or konsole. On my work computer (RHEL 5 or maybe 4), this does not happen in any terminals, including gnome-terminal. I assume there is some environment variable that controls this, but my .bashrc at work is hundreds of lines long, so I'm not sure where to look in there.

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