How to make mv work with exotic directory names? I created several scripts to move messages tagged via notmuch notmuch between Maildir directories. Having multiple accounts, I have some issues with the names of some directories mbsync created when syncing with gmail. Here is my typical Maildir structure for gmail accounts: gmail-user2 ├── [Gmail] │ …
Shell: How to print all files in a folder with cat with files separator If I do cat * in a directory, then I cannot easily see when I switch from one file to the next. I would like to have a visual indication that the files are not the same. I tried options -n …
help with bash script to [grep sed cut] smartctl output to desired format If anyone is good at writing bash scripts, and is inclined to do the following, I am looking to achieve this: i am horrible at writing bash and more horrible at using cut or sed, and if this can be done with …
Append the arguments to a script as lines in a file How do you append $@ or $* , each as a new line to a file? I think I already searched for that before. Adding a new option -i –insert-newline with possible values 1, 2, 3 or Linux, Windows, Mac to echo command should …
how to de-duplicate block (timestamp+command) from bash history? I’m working with bash_history file containing blocks with the following format: #unixtimestampncommandn here’s sample of the bash_history file: #1713308636 cat > ./initramfs/init << "EOF" #!/bin/sh /bin/sh EOF #1713308642 file initramfs/init #1713308686 cpio -v -t -F init.cpio #1713308689 cpio -v -t -F init.cpio #1713308690 ls #1713308691 ls My …
How to make bc handle explicitly positive numbers? Consider the following: $ echo "-1" | bc -1 $ echo "(1)" | bc 1 $ echo "+1" | bc (standard_in) 1: syntax error Minus sign and round braces are handled correctly but when explicit plus sign is specified bc falls with error. Is it possible to …
how to replace the last n occurences of string using sed I can replace the third occurrence of a string with: sed ‘s/OLD/NEW/3’ or, with the GNU implementation of sed, all occurrences starting from the third with: sed ‘s/OLD/NEW/3g’ But how do I replace the last 3 (or n) occurrences? Asked By: dhm || Source …
Diagnose bash autocomplete issues I have one binary on my system, fio installed via package manager which doesn’t autocomplete files with tab once you’ve typed fio . I guess this means something must over overridding the autocomplete behavior but I don’t even know how to begin diagnosing it. Asked By: BeeOnRope || Source I would …
Setting PS1 with site-wide configuration I’ve had problems with people logging into some servers via ssh and forgetting that a specific terminal is no longer local. Today someone tried to shutdown their laptop with sudo shutdown -h now, and accidentally took down a server. I’d like to change the colour of bash’s PS1 on these …
printf – store formatted string output in a variable Instead of the following printf ‘%st%st%st%sn’ ‘index’ ‘podcast’ ‘website’ ‘YouTube’ I want to store the printf output in a Results variable, how can I do this? Asked By: Porcupine || Source Bash (since 3.1), zsh (since 5.3) and ksh93 (since v- and u+m 2021-11-28) have an …
Use a here-document to create a script for AWK Why doesn’t this work? #!/bin/bash DOMAIN="example.com" PING_COUNT=3 #prints column header awk ‘BEGIN {printf("%-8s %-8s %-8s %-8s %sn", "avg", "min", "max", "mdev", "hostname")}’ FORMAT_RESULTS=$(cat << EOF ‘{ split($0, line, " = ") split(line[1], temp) hostname = temp[2] split(line[2], temp) split(temp[1], stats, "/") min = stats[1] avg = …
Sorting Bash History for Redundancy Removal I’m working with my .bash_history file and want to identify repetitive commands for cleanup. Here’s a sample snippet: … #1713251479 sh lowbat.sh #1713251495 nvim lowbat.sh #1713252186 sh lowbat.sh #1713253121 xclip -sel clip lowbat.sh #1713253722 cd code/dotfiles/ #1713253766 git add mpv/ … My goal is to: Sort the commands alphabetically …
how to columnate list of strings in two lines, aligned to the length of the first column I have a list of strings: python2-distutils-extra|==>|python2-distutils-extra|2.39-5|Enhancements to the Python build system python2-fuse|==>|python2-fuse|1.0.5-1|This is a Python 2 interface to libfuse (https://github.com/libfuse/libfuse), a simple interface for userspace programs to export a virtual filesystem to the Linux kernel python2-gobject2|==>|python2-gobject2|2.28.7-7|Legacy Python …
AWK: regex is not processed when passed as a variable Any suggestions? I read: Escape Sequences (The GNU Awk User’s Guide) Representative Example $ Filesystem=’/dev/mapper/vgubuntu-Media’ $ FilesystemRegex="$(echo "${Filesystem}" | sed "s~/~\/~g")" $ echo "$FilesystemRegex" /dev/mapper/vgubuntu-Media $ df -H "${Filesystem}" | awk -v Regex="${FilesystemRegex}" ‘/$Regex/{print $5}’ awk: warning: escape sequence `/’ treated as plain `/’ $ …
How do I get bash to use a specific directory when running a command? I have a problem with the handling of the mysql command. When I try to use mysql -uroot -p, I get an error: Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’ (2) However, when I try to use ./mysql -uroot -p from /data/local/tool/mysql-5.6.21/bin, I can connect to …
`command echo –help` invokes bash internal echo function According to help command, the help of bash, command can be used to trigger the external program x, if x exists as a builtin function too: command: command [-pVv] command [arg …] Execute a simple command or display information about commands. Runs COMMAND with ARGS suppressing shell …
pipe to a different file descriptor Following up on Using while loop to ssh to multiple servers, i.e., for while IFS= read -r -u9 HOST ; do ssh "$HOST" "uname -a" ; done 9< servers.txt which reads from a different file descriptor (9), How to make it read from a pipe of a different file …
bash/sed replace string of repeating string within a string I have a file where each line represents data that may be encompassed with a string like "o o ". I need to replace the string between the encompassing characters with another string. The "internal" string is a pattern of two characters that may include an …
Remove /dev mount point without unmount in Host Here is the unmount method for unmounting all previously mounted folders: https://unix.stackexchange.com/questions/61885/how-to-unmount-a-formerly-chrootd-filesystem I use the following command to mount the /sys and /dev to the chroot from the Ubuntu host: cd /path/to/chroot/ mount -t sysfs /sys sys mount -o bind /dev dev If I delete the /sys …
How can I add a property in the end of the object (text manipulation) I’m doing some text manipulation and I want to add a property (at the end) to an object named "object" that is inside a configuration file e.g . . object = { "one": "one", "two": "two", } . . Should become …
