New answers tagged scripting
0
votes
am not sure how to write on other file
To create a properly formatted YAML file from your variables, it is best to use a YAML-aware tool, such as yq from https://kislyuk.github.io/yq/
With it, you could write your script like so:
#!/bin/...
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0
votes
am not sure how to write on other file
If you have a variable, you can echo that variable to the file:
echo "username: $name" > newfile
echo "lastname: $last" >> newfile
Read on "stream redirection in ...
- 2,287
0
votes
How do script a file rename functions to remove random character suffix
In zsh:
autoload -Uz zmv
zmv -n '(*.txt)_[[:lower:]](#c4)' '$1'
(remove the -n for dry-run if happy)
Would rename the files whose name ends in .txt followed by 4 lowercase letters (replace [[:lower:]]...
- 482k
2
votes
How do script a file rename functions to remove random character suffix
You can use rename command with regex for batch rename.
In debian based distros, this package is called 'rename'; in arch based distros it is called perl-rename.
(This regex assumes that all the files ...
- 35
0
votes
Running minicom from a bash script for X amount of time (and getting the output)
minicom documents an option to capture output:
-C, --capturefile=FILE
filename. Open capture file at startup.
...
L Turn Capture file on off. If turned on, all output sent to the
...
- 32.9k
0
votes
Script to change file/folder names which contain illegal characters (Synology NAS)
If bash is available on that system:
LC_ALL=C find /path/to/share -depth -name '*:*' -type d -exec bash -c '
for file do
base=${file##*/}
mv -i "$file" "${file%/*}${base//:}&...
- 482k
0
votes
Script to change file/folder names which contain illegal characters (Synology NAS)
If it's just the : that is causing trouble, you could use find with rename option to replace that character with something else.
find /path/to/share -name "*:*" -exec rename 's/\:/_/' {} \;
...
- 101
0
votes
Using case and arrays together in bash
For bash users, you can use the non-short-circuiting ;;& operator; it's not case directly supporting arrays in its clauses, but it's reasonably elegant:
ARR=( opt1 opt2 opt3 );
case $1 in
*)
...
- 101
1
vote
Batch remove invisible characters from filenames
I'm not sure if this really is an answer as I wasn't able to make it work from macOS, but it certainly is a workaround that solved my problem.
Since the external drive was a NAS, I ssh'ed into it and ...
- 141
4
votes
Split a record by record type and report any unexpected record type
Using any awk and any sort:
$ cat tst.sh
#!/usr/bin/env bash
awk '
BEGIN {
split("E20 I47 I49 I50 Q11 R11 W55",tmp)
for ( i in tmp ) {
expected[tmp[i]]
...
- 24.5k
5
votes
Accepted
Split a record by record type and report any unexpected record type
Here's one awk way. First, create a file with the "good" records, one per line:
$ cat goodRecs
E20
I47
I49
I50
Q11
R11
W55
Then:
gawk 'FNR==NR{good[$1]; next}
{
rec=substr($...
- 221k
17
votes
Why does the += operator fail to increment value?
In most Bourne-like shells (ksh, bash,zsh), the += operator works over three different variable types.
For a normal variable, a string variable, this happens:
$ a=hello
$ a+=3
$ echo "$a"
...
- 1,769
4
votes
Why does the += operator fail to increment value?
In the feature-rich POSIX-like shells (ksh, mksh, Bash, zsh) the += operator is a string concatenation operator when used on regular scalar variables. The result you're seeing is exactly what you ...
- 27.2k
-1
votes
Capabilities for a script on Linux
Now, in the year 2022 and if your system uses systemd, you may also create a systemd unit config and run the script from there, also listing the required capabilities with CapabilityBoundingSet= ...
- 119
0
votes
Find words in a list that start with words from another list excluding vowels
With zsh:
#! /bin/zsh -
words=(foobar foobarbaz STRING)
strings=(fbr STRN xyz)
vowels=aeiouAEIOU # adjust as needed
typeset -A matches=()
for word ($words) {
word_without_vowels=${word//[$vowels]}
...
- 482k
2
votes
Need to remove files older then 90 days with an exception of last day of the month
I like the other answers, but I have a simpler solution.
Also, the original question assumes that the last-of-month (date) file is always there. But we all know that you don't always have the snapshot ...
- 1,227
2
votes
Need to remove files older then 90 days with an exception of last day of the month
Last day of the month are the ones ending in 0131, 0331, 0430... 1231 and 0229 for bissextile years and 0228 on other years.
With GNU date and a shell with support for zsh-style {x..y} brace expansion,...
- 482k
3
votes
Need to remove files older then 90 days with an exception of last day of the month
Assuming that's the date at the end of the file name you want to consider (the 20220531 in ABC.txt.20220531), in zsh, you could do:
#! /bin/zsh -
zmodload zsh/datetime
day=86400
strftime -s range '&...
- 482k
1
vote
Issue - infinite loop using while on ksh script
There is no obvious reason for any loop to become "infinite". However, re-writing the exact same script but extracting each file name to a variable we get a more legible version, IMO.
day=`...
- 1,769
0
votes
Extracting nested zip files
How can I recursively extract zip files that contain zip files in folders (nested zips in folders) & repack them into 7z format in a bash (shell) script? Or a tool with this functionality?
Ex: ...
- 11
0
votes
Automate user input into script (using ssh)
Either use expect or try this ugly hackery
( sleep 2; echo 'cd /map1'; sleep 2; echo 'reset'; sleep 2 ) | ssh ipmiService
- 93.6k
1
vote
Read and convert date from file
$ let diff=($(date +%s -d 'today')-$(date +%s -f VM1_EOMAP_TIME.log))/60
$ echo "$diff"
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1
vote
Read and convert date from file
Your problem is quoting.
And that you should use date -u to compensate for timezone.
$ echo "07 Sep 2022 16:30" > infile
$ var="$(<infile)"
$ cat infile; echo "$var"...
- 1,769
1
vote
Read and convert date from file
If your bash is recent, the current time in epoch seconds is builtin: $EPOCHSECONDS
Otherwise, bash's printf can get it with the %(fmt)T directive and magic value "-1":
printf -v ...
- 79.8k
0
votes
Shell Script - Check whether a single character input is uppercase or lowercase or special character
be sure to wrap the variables in quotes - if you are testing a regular expression as a string, for example, you could enter the following:
echo "enter a US state name"
read var_1
if [[ &...
- 111
3
votes
Accepted
How can hostnames vary without having to add another name?
/etc/hosts only maps fixed IPv4/v6 addresses to fixed names, and vice versa. There are no wildcards available in its syntax.
If the rather simplistic /etc/hosts is inadequate for your requirements, ...
- 72.4k
0
votes
Retrieve X11 window ID of a just-launched GUI-program
Using python gi library, (assuming that this program that has been launched most recently is on top of the window stack)
import gi
gi.require_version('Wnck', '3.0')
from gi.repository import Wnck , ...
- 21
0
votes
How to send variable to an inline shell-script?
How about a subshell instead?
When I used to use inline scripts often it was because I wasn't aware of how to use subshells.
I just found the answer for how to pass variables to a subshell, but this ...
- 435
1
vote
Linux: Autorun : "Run file from USB when usb is inserted "
By default scripts called autorun.sh on any drives root directory will be automatically executed at least on Ubuntu Desktop.
However be aware that you need to be able to set execution permissions on ...
- 11
0
votes
Is there a way to activate a particular tab of chrome via bash?
I tweaked Geoffroy's answer a bit since it didnt work for me.
wmctrl -lx is used to get all windows and their titles. The current tab title is inside the windows tab name.
wmctrl -ia is used to ...
1
vote
Accepted
How to create a sh script that can give as output the exact string I want using the awk command
This code may work (stripping first two symbols from the string):
ps ax | awk '/bhyve: [vm]/{print substr($6,3)}'
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2
votes
regexp to only extract first set/group of numbers from line of string from a file
Given the file
shell> cat /tmp/login.defs
PASS_MAX_DAYS 30
PASS_MAX_DAYS 30 .12
PASS_MAX_DAYS $30
PASS_MAX_DAYS 30 23
PASS_MAX_DAYS 30 days
PASS_MAX_@DAYS 30
Read the file
- command: cat /tmp/...
- 1,531
0
votes
Accepted
How to extract txt files from multple folders and merging all into a single folder?
Go to the root folder of 100 sub folders and find all of the .txt files, copy them into the new folder ~/tests:
find ./ -type f -name "*.txt" -exec cp "{}" ~/tests/ \;
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1
vote
extract TOC from epub
The way your script is written, the for loop only has one thing to iterate over, a single filename (which probably doesn't exist) called "1.epub 2.epub". That's not a list of two filenames, ...
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