Tagged Questions
4
votes
2answers
53 views
Convert MAC address to Link-local address with bash
How can I convert a Mac address into an ipv6 Link-Local address?
you have to add fe80:: at the start and insert ff:fe in the middle
furthermore all leading zeros must be stripped
2
votes
1answer
61 views
shell parameter substitution to rename files
I need to rename filenames which starts with "foo" into "boo"
This is the script I used
#!/bin/sh
for f in *.jpg;
do
mv -- "{$f}" "${f/foo/boo}";
done
but when i run I get a bad substitution ...
2
votes
2answers
145 views
Testing a string containing only spaces (tabs, or “ ”)?
My code below doesn't work:
stringZ=" "
if [[ "$stringZ" == ^[[:blank:]][[:blank:]]*$ ]];then
echo string is blank
else
echo string is not blank
fi
Result:
string is not blank # wrong
...
0
votes
3answers
118 views
Extract the base file name from a URL
url=http://www.foo.bar/file.ext; echo ${url##/*}
I expected this code to print file.ext, but it prints the whole URL. Why? How can I extract the file name?
2
votes
2answers
302 views
How to defer variable expansion
I was wanting to initialize some strings at the top of my script with variables that have no yet been set, such as:
str1='I went to ${PLACE} and saw ${EVENT}'
str2='If you do ${ACTION} you will ...
1
vote
2answers
322 views
How to correctly concatenate strings in shells script?
I have a bash shell which I need to modify, and I have to set a variable in a script and then call another script. My variable, EXTRA_JAVA_OPTIONS must be
-javaagent:myagent.jar="-d 0 -i 1000 -l log2 ...
6
votes
7answers
736 views
Bash - Continuous String Manipulation
#!/bin/bash
FILE="$(basename "$1")"
FILE="${FILE/%.jpeg/.jpg}"
Is there anyway to glue these two lines together into a one-liner?
2
votes
3answers
304 views
Find word in sentence with Bourne Shell (sh)
I'm trying to determine if a particular word appears in a sentence using Bourne Shell (sh). For example:
#!/bin/bash
INPUT='Lorem ipsum dolor sit amet.'
if [[ "$INPUT" == *dolor* ]]
then
echo ...
1
vote
4answers
340 views
Stripping all vowels but the first from a set of strings
I have a string comprised of multiple substrings, separated by underscores. For example: AbcdAEfd_hEgdgE_AbAAAAA. I need to remove all vowels except the first from each substring. So:
AbcdAEfd -> ...
3
votes
2answers
227 views
Change string occurrences in file while respecting DOS new line sequences
I use Visual Studio for my C# development while using Cygwin for some of the tasks that require scripting. Recently I wanted to change all occurrences of string AAA to BBB in my project's files. I ...
3
votes
3answers
439 views
Extracting text from a text file in bash
I have a large text file that is all one line. In the text are several sections that looks like foo=12345 and I need to extract them all as separate lines, ignoring the rest of the file.
For ...
7
votes
3answers
4k views
Bash - test for newline?
In various places around the web I've found:
\015
\012
\x0a - hex
\n
\r
all as synonyms for various newlines / carriage returns...
But in this small script I cannot recognise when I come across a ...
2
votes
4answers
218 views
Generate lists of page numbers for 2-up duplex printing: 2,3,… and 1,4,…
How can I generate the following increments?
2,3,6,7,10,11,14,15,18,19,22,23,26,27,30,31,34,35,38,39,42,43,46,47,...,135
and
...
2
votes
3answers
1k views
Bash string replace multiple chars with one
I'm replacing, from a feed title, all chars except letters and digits with a dash to use the result as a safe filename for any filesystem:
$ t="Episodie 06: No hope of riding home (NEW) - Advanced ...
1
vote
1answer
159 views
Check a bash variable against a file
I have a bash variable ($HTTP_COOKIE) which contains a string. I want to check if this string matches the content of a given file (token). I'm working on a busybox linux.
How should I do?
