You need to source the file as: . myfile.sh or source myfile.sh Without sourcing the changes will happen in the sub-shell and not in the parent shell which is invoking the script. But when you source a file the lines in the file are executed as if they were typed at the command line.
With a regex and Parameter Expansion: for i in *; do [[ $i =~ [0-9]{8}|[0-9]{4}-[0-9]{2}-[0-9]{2} ]] x=”${BASH_REMATCH[0]//-/}” y=”${x:0:4}” m=”${x:4:2}” d=”${x:6:2}” echo “$y $m $d” done | sort -n Output: 2010 12 20 2016 01 01 2016 04 13 2017 01 11
The logic is quite simple as such. So we look at bash source code (4.4) itself subst.c:9273 case ‘`’: /* Backquoted command substitution. */ { t_index = sindex++; temp = string_extract(string, &sindex, “`”, SX_REQMATCH); /* The test of sindex against t_index is to allow bare instances of ` to pass through, for backwards compatibility. */ … Read more
If you’re writing a bash script, call it by name: #!/bin/bash /bin/sh is not guaranteed to be bash. This caused a ton of broken scripts in Ubuntu some years ago (IIRC). The source builtin works just fine in bash; but you might as well just use dot like Norman suggested.
This is the script I used (Updated Version with input from @elquimista from the comments) #!/bin/bash ln -fs /usr/share/zoneinfo/America/New_York /etc/localtime DEBIAN_FRONTEND=noninteractive apt-get install -y tzdata dpkg-reconfigure –frontend noninteractive tzdata Seems to work fine. As one liner: DEBIAN_FRONTEND=noninteractive apt-get install -y –no-install-recommends tzdata
You can use cut to access the second field: cut -f2 Edit: Sorry, didn’t realise that SVN doesn’t use tabs in its output, so that’s a bit useless. You can tailor cut to the output but it’s a bit fragile – something like cut -c 10- would work, but the exact value will depend on … Read more
Put something like: PATH=/your/jdk/bin/path:${PATH} export PATH That way, your path gets prepended to the regular PATH environment. And simply log out and log back in to reset your environment. Or type this: export PATH=/usr/bin:/usr/local/bin or this . /etc/profile to reload a basic environment if you can’t get an editor to work right now.
What about the following: awk -F, ‘(NR==FNR){a[$1];next}!($1 in a)’ blacklist.csv candidates.csv How does this work? An awk program is a series of pattern-action pairs, written as: condition { action } condition { action } … where condition is typically an expression and action a series of commands. Here, the first condition-action pairs read: (NR==FNR){a[$1];next} if … Read more
Try this: script -q -c ‘module help null’ /dev/null > aaa.txt This works in a shell script (non-interactively) using $ script –version script (util-linux-ng 2.16) You may also be able to use expect. Also see: Catching a direct redirect to /dev/tty.
IFS is not a single, multicharcter delimiter; instead, it is a collection of single-character delimiters. You can use a regular expression to break apart two fields separated by an arbitrary delimiter. regex='(.*) >> (.*)’ while IFS= read -r line dest do [[ $line =~ $regex ]] || continue src=${BASH_REMATCH[1]} dest=${BASH_REMATCH[2]} if [[ -n $src ]]; … Read more