2
votes
1answer
42 views

How to use quick substitution to replace all the strings of the previous command? [duplicate]

I know I can replace a string of the previous command using ^old^new. But it seems to only replace the first occurrences as I do the follow: $ cat /proc/5742/task/5742/status ... $ ^5742^2839 cat ...
7
votes
7answers
505 views

Find out what command I last ran that starts a certain way?

On bash commandline environment, you can do !! to rerun your last command. And you can press up arrow to see the the last command you ran. But what if you want to only see but not run the last command ...
4
votes
1answer
136 views

Why do piping and redirection work differently with here documents?

Combining a redirect with a here document seems logical enough: $ bash > foo <<EOF echo Hello EOF $ less foo Hello But with a pipe it behaves differently: $ bash | tee foo <<EOF ...
17
votes
2answers
598 views

^x^y unix trick for all instances in last command?

One of my favorite Unix tricks is ^x^y, which will take the last command and replace the first instance of "x" with "y". However, I'm wondering if a similar trick works to replace all instances of "x" ...
2
votes
3answers
61 views

Why does bash have a HISTCONTROL=ignorespace option?

Or to phrase it differently, why would you want to prevent commands from being written to the bash history? (Inspired by a related question.)
11
votes
1answer
186 views

Why is bash not storing commands that start with spaces?

If I perform a sequence of commands like: $ ls $ grep abc file.txt and then use the up arrow key to get the previous one, the terminal will show the last cmd (which is the grep here) But if I do ...
0
votes
1answer
34 views

Using !n in script or interactive mode

I add to ~/.bashrc the following code: test_exclamation () { printf %s "$READLINE_LINE" | xargs echo } bind -x '"\eX": test_exclamation' I write to bash prompt buffer $ !1700 If I press Enter, ...
1
vote
3answers
55 views

Copy command from history to bash prompt

Sometimes I'd like to get some command from history output, copy it to bash prompt, make some changes and run it. Is there a way to copy command from a history output to bash prompt without involving ...
3
votes
2answers
101 views

“history” stops working when run inside bash script

I am writing a simple script to grep my bash history to find a particular string. On the command line, I can do the following, which works fine: history | grep git However, when I create a bash ...
2
votes
1answer
62 views

Changing HISTTIMEFORMAT leaves entries with incorrect date

After exporting HISTTIMEFORMAT='%F %T' I tried to query history But the result shows all the commands are executed on same day. How can I check the actual date and time of actual command execution?
2
votes
3answers
51 views

How to start first command from the list printed by command 'history | grep something'

For example, I have the following output from command: loom@loom:$ history | grep MAKE 219 ../build.sh -DCMAKE_BUILD_TYPE=Debug .. 909 history | grep MAKE How to write a command, that start ...
3
votes
1answer
54 views

Root complete history commands

Where can I get root's history except besides .sh_history? I've gotten some information but only from .sh_history and the history command.
2
votes
1answer
39 views

How to get a history entry to properly display on multiple lines

Suppose I have entered a function at the bash prompt, on multiple lines rather than squeezing it onto one with semicolons: $ function blah { echo blah } $ history -1 12690 function blah {\necho ...
2
votes
2answers
98 views

Bash's declare -p HISTIGNORE brings bash to a halt! Why?

Executing the following code in GNU bash, Version 4.2.45(1)-release (x86_64-redhat-linux-gnu), Fedora 19 ... shopt -s extglob export ...
0
votes
1answer
81 views

Where does bash store the time commands were executed?

Enabling history to display time via export HISTTIMEFORMAT='%F %T ' shows the times of the commands but .bash_history doesn't contain any times. Where does bash store the times the commands were ...
4
votes
2answers
200 views

Re-execute fc command from history

Sometimes I am using the fc builtin in bash (3.2 if that matters), to recall commands from the history. This also offers the possibility to edit, before execution. For example, by typing fc 23 27 ...
2
votes
2answers
69 views

How can I recall a numbered history command for edit?

I frequently search for changes with history | grep 'string' I get a list of commands in my history, along with the history line number), e.g. history | grep 'git' 755 git status 1535 git push ...
5
votes
2answers
145 views

Why does !! inside an alias not work?

I have this alias set in my system /etc/bashrc file: alias root="sudo !!" The intention of this being to run the last used command using sudo of course. When used, it of course appears to ...
3
votes
2answers
90 views

Is it possible to transfer the history of commands from one system to another?

I am going to have all my data transferred to a new PC. Is it possible to transfer the command history of the previous Linux to the new system as well? So that when I type the history command, I get ...
0
votes
1answer
238 views

Automatically save bash command history in screen session [duplicate]

I connect to a screen session. After doing some stuff I detach it. Then in history | tail I only see screen -r and previous commands and not the commands run in screen session. Basically history shows ...
10
votes
4answers
474 views

Search for a previous command with the same prefix when I press Up at a shell prompt

Coming from a FreeBSD world I wish to make the Linux terminal behave like FreeBSD one, especially the 9.1 version, basically when you type cd in the terminal and push the "up" arrow you can browse all ...
0
votes
2answers
79 views

Why must you be careful when using Bash's built in command history function to re-run previous commands that contain variables?

I know !! re-runs commands but what exactly would occur if I re-ran a command that had a variable in the command?
14
votes
2answers
302 views

bash_history: comment out dangerous commands: `#`

To prevent logging "dangerous" commands in bash history, I have added following line to my .bashrc file: HISTIGNORE='rm *:mv *:cp *:cat*>*:pv*>*' this works well, but it has a side effect: I ...
3
votes
2answers
76 views

How to show last command with expanding function in bash

I'm using function like this. $ find-grep () { find . -type f -name "$1" -print0 | xargs -0 grep "$2" ; } After I type: $ find-grep *.c foo I want to get expanded last command string. In this ...
3
votes
1answer
112 views

What could cause my bash history to be cleared unexpectedly?

Today I noticed that my bash history is cleared completely. I have neither executed history -c nor deleted the .bash_history file. Apart from deleting the .bash_history file and history -c, how can ...
17
votes
1answer
746 views

What does !$ mean?

I'm following through a tutorial and it mentions to run this command: sudo chmod 700 !$ I'm not familiar with !$. What does it mean?
4
votes
2answers
90 views

Why do I see different versions of bash history for the same user

I ssh into my servers using root. Sometimes when I scroll back in my history, I see a history from an earlier session, but not the last session. Why does this happen with the same user account? Is ...
0
votes
1answer
449 views

HISTTIMEFORMAT does not show correct date and time for history

After exporting HISTTIMEFORMAT='%F %T' I tried to query history But the result shows all the commands are executed on same day. How can I check the actual date and time of actual command execution?
1
vote
2answers
199 views

shell saves ip address that you ping? [duplicate]

I was once shown a shortcut that I can't recall/ find. After pinging an ip, then attempting to ssh into it - the ip was saved into to a variable automagically. Something like: ping 10.1.23.4 ...
14
votes
5answers
472 views

Use same arguments with different command [duplicate]

Here's something I find myself doing often: less super/long/file/name Followed by: vim super/long/file/name Is there an easy way to pass the args of the previous command over to the next? SO I'd ...
4
votes
1answer
451 views

how to enable command history of shell

I am using ubuntu 13.04, in this the command history of the shell is getting erased on close. Can someone tell me how to prevent this from happening?
11
votes
1answer
448 views

How can I `alias sudo !!`?

I'm trying to set an alias for sudo !! in Bash. I tried alias sbb='sudo !!', but it interprets that as a literal !! and prints sudo: !!: command not found If I use double quotes, it substitutes ...
4
votes
3answers
152 views

Tricks for avoiding bash history logging? [duplicate]

What are some tricks for avoiding bash history being logged in a fascist logging environment that does not involve modifying .bash_rc or deleting content from within the history file?
2
votes
6answers
149 views

Bash - Split the previous commands parameters

How would one parse the previous command in bash? Example: root$ ssh foo@1.2.3.4 root$ echo !$ &>/tmp/foo.txt root$ cat /tmp/foo.txt foo@1.2.3.4 Goal: Send just the ipaddress 1.2.3.4 to ...
0
votes
2answers
179 views

How to use the last command in the while loop?

I am wondering how to modify this code. ls while [ 1 > 0 ] do fc -s sleep 1 done For fc -s, you can refer to this question for details. My question are as follows: How will it run? If you ...
4
votes
1answer
116 views

Diff the output of the last two commands

I frequently find myself doing something like the following: $ big long command 1 $ big long command 2 $ diff -u <(big long command 1) <(big long command 2) How can I get the shell (bash in ...
5
votes
1answer
137 views

Why does `!45` get replaced with `top`?

I was trying to a string search within Ubuntu 12.04 which went as follows: find . -exec grep -l "!45" {} \; Instead of searching for the string "!45", it was replaced with top. It didn't invoke the ...
3
votes
1answer
44 views

How to revert direction for last parameter shortcut?

I can append a last used parameter via the keyboard shortcut Alt + . yet sometimes, I type too fast and miss my actual target. If I wanted to go back one instance, is there a way to do it? I ...
4
votes
1answer
91 views

History of commands and directories we were in

I was wondering: If I type history I can see the previous commands I typed and see what happened and perhaps keep commands as reference. But I don't know in which directory I was when I typed the ...
2
votes
3answers
206 views

Shell: How do I get the last argument the previous command when it was detached?

Within the shell, typing ALT+. or using !$ recalls the last passed argument of the previous command. I use this all the time, but how do you do that when you detached the previous command? $ ...
4
votes
3answers
160 views

Use bash history file from old machine when setting up new machine?

I love my bash history. Sometimes I've issued really long commands and I really depend on my bash history to get them back quickly. I've increased my history size with: HISTSIZE=100000 ...
1
vote
0answers
30 views

why bash history overlap the prompt when scroll up in the history? [duplicate]

I customized my bash prompt, PS1 value. ~/.bashrc: Color_Off='\e[0m' # Text Reset BGreen='\e[1;32m' # Green BPurple='\e[1;35m' # Purple BWhite='\e[1;37m' # White ...
25
votes
3answers
2k views

Why shouldn't someone use passwords in the command line?

Why do people fear writing passwords in the command line? The history file is located in ~/.history, so it's available only to the user who executed the commands (and root).
4
votes
4answers
162 views

echoing symbols in terminal/bash

Why am I not able to use "!" when trying to echo a message in terminal? For example: echo -e "Hello\nWorld!" bash returns the following command: bash !: event not found
3
votes
3answers
135 views

Persistent shell arguments

I often find myself running a series of commands on a single set of arguments. For example: $ nmap -Pn -sS 192.168.1.5 $ ssh 192.168.1.5 $ curl 192.168.1.5 $ wget -r 192.168.1.5 This can be sped ...
17
votes
5answers
1k views

In what situations would a user not let the shell record his command into history?

If I add export HISTCONTROL=ignorespace in .bashrc, bash won't record any commands which have whitespace before them into history. But I do not understand under what situations it will be useful. ...
3
votes
1answer
87 views

Keep two bash history files, one with ignoredups, one with everything

For the purposes of looking at which commands I am using the most, I'd like to keep a record of command I type in my bash history (even duplicates). But, for sanity and ease of use, I still want to ...
4
votes
2answers
131 views

Bash Command (History) Number In PS1

I am a noob in bash to be honest. I have Googled around and cannot find an answer to this: history lists previous commands and their number e.g. $ history 286 clear I want to be able to see the ...
1
vote
3answers
252 views

Best tool for monitoring server usage

I was just wondering what the best tools for retracing logs and what logs I should be checking to work out what's going wrong with a server, or what the client has executed to get the server into it's ...
7
votes
1answer
4k views

Delete last N lines from bash history

When accidentally pasting a file into the shell it puts a ton of ugly nonsense entries in the bah history. Is there a clean way to remove those entries? Obviously I could close the shell and edit the ...